Remove unused classes and stray headers

Found by reviewing headers with 1 or less matching includes:
```
find -name thirdparty -prune -o -name "*.h" -exec basename {} \; | sort -u > headers
for header in $(cat headers); do echo "$header: "; rg -l "#include \"(.*/)?$header\"" | wc -l; done > list-includes
```

2 files changed, 0 insertions, 349 deletions

diff --git a/editor/doc/doc_dump.cpp b/editor/doc/doc_dump.cpp
deleted file mode 100644
index b0a89ff4b8..0000000000
--- a/editor/doc/doc_dump.cpp
+++ /dev/null
@@ -1,308 +0,0 @@
-/*************************************************************************/
-/*  doc_dump.cpp                                                         */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-#include "doc_dump.h"
-
-#include "core/os/file_access.h"
-#include "core/version.h"
-#include "scene/main/node.h"
-
-static void _write_string(FileAccess *f, int p_tablevel, const String &p_string) {
-
-	String tab;
-	for (int i = 0; i < p_tablevel; i++)
-		tab += "\t";
-	f->store_string(tab + p_string + "\n");
-}
-
-struct _ConstantSort {
-
-	String name;
-	int value;
-	bool operator<(const _ConstantSort &p_c) const {
-
-		String left_a = name.find("_") == -1 ? name : name.substr(0, name.find("_"));
-		String left_b = p_c.name.find("_") == -1 ? p_c.name : p_c.name.substr(0, p_c.name.find("_"));
-		if (left_a == left_b)
-			return value < p_c.value;
-		else
-			return left_a < left_b;
-	}
-};
-
-static String _escape_string(const String &p_str) {
-
-	String ret = p_str;
-	ret = ret.replace("&", "&amp;");
-	ret = ret.replace("<", "&gt;");
-	ret = ret.replace(">", "&lt;");
-	ret = ret.replace("'", "&apos;");
-	ret = ret.replace("\"", "&quot;");
-	for (char i = 1; i < 32; i++) {
-
-		char chr[2] = { i, 0 };
-		ret = ret.replace(chr, "&#" + String::num(i) + ";");
-	}
-	ret = ret.utf8();
-	return ret;
-}
-void DocDump::dump(const String &p_file) {
-
-	List<StringName> class_list;
-	ClassDB::get_class_list(&class_list);
-
-	class_list.sort_custom<StringName::AlphCompare>();
-
-	FileAccess *f = FileAccess::open(p_file, FileAccess::WRITE);
-
-	_write_string(f, 0, "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>");
-	_write_string(f, 0, String("<doc version=\"") + VERSION_BRANCH + "\" name=\"Engine Types\">");
-
-	while (class_list.size()) {
-
-		String name = class_list.front()->get();
-
-		String header = "<class name=\"" + name + "\"";
-		String inherits = ClassDB::get_parent_class(name);
-		if (inherits != "")
-			header += " inherits=\"" + inherits + "\"";
-		_write_string(f, 0, header);
-
-		_write_string(f, 1, "<brief_description>");
-		_write_string(f, 1, "</brief_description>");
-
-		_write_string(f, 1, "<description>");
-		_write_string(f, 1, "</description>");
-
-		_write_string(f, 1, "<methods>");
-
-		List<MethodInfo> method_list;
-		ClassDB::get_method_list(name, &method_list, true);
-		method_list.sort();
-
-		for (List<MethodInfo>::Element *E = method_list.front(); E; E = E->next()) {
-			if (E->get().name == "" || E->get().name[0] == '_')
-				continue; //hidden
-
-			MethodBind *m = ClassDB::get_method(name, E->get().name);
-
-			String qualifiers;
-			if (E->get().flags & METHOD_FLAG_CONST)
-				qualifiers += "qualifiers=\"const\"";
-
-			_write_string(f, 2, "<method name=\"" + _escape_string(E->get().name) + "\" " + qualifiers + " >");
-
-			for (int i = -1; i < E->get().arguments.size(); i++) {
-
-				PropertyInfo arginfo;
-
-				if (i == -1) {
-
-					arginfo = E->get().return_val;
-					String type_name = (arginfo.hint == PROPERTY_HINT_RESOURCE_TYPE) ? arginfo.hint_string : Variant::get_type_name(arginfo.type);
-
-					if (arginfo.type == Variant::NIL)
-						continue;
-					_write_string(f, 3, "<return type=\"" + type_name + "\">");
-				} else {
-
-					arginfo = E->get().arguments[i];
-
-					String type_name;
-
-					if (arginfo.hint == PROPERTY_HINT_RESOURCE_TYPE)
-						type_name = arginfo.hint_string;
-					else if (arginfo.type == Variant::NIL)
-						type_name = "Variant";
-					else
-						type_name = Variant::get_type_name(arginfo.type);
-
-					if (m && m->has_default_argument(i)) {
-						Variant default_arg = m->get_default_argument(i);
-						String default_arg_text = String(_escape_string(m->get_default_argument(i)));
-
-						switch (default_arg.get_type()) {
-
-							case Variant::NIL:
-								default_arg_text = "NULL";
-								break;
-							// atomic types
-							case Variant::BOOL:
-								if (bool(default_arg))
-									default_arg_text = "true";
-								else
-									default_arg_text = "false";
-								break;
-							case Variant::INT:
-							case Variant::FLOAT:
-								//keep it
-								break;
-							case Variant::STRING:
-							case Variant::STRING_NAME:
-								default_arg_text = "@\"" + default_arg_text + "\"";
-								break;
-							case Variant::NODE_PATH:
-								default_arg_text = "\"" + default_arg_text + "\"";
-								break;
-							case Variant::TRANSFORM:
-								if (default_arg.operator Transform() == Transform()) {
-									default_arg_text = "";
-								}
-
-								default_arg_text = Variant::get_type_name(default_arg.get_type()) + "(" + default_arg_text + ")";
-								break;
-
-							case Variant::VECTOR2:
-							case Variant::RECT2:
-							case Variant::VECTOR3:
-							case Variant::PLANE:
-							case Variant::QUAT:
-							case Variant::AABB:
-							case Variant::BASIS:
-							case Variant::COLOR:
-							case Variant::PACKED_BYTE_ARRAY:
-							case Variant::PACKED_INT32_ARRAY:
-							case Variant::PACKED_FLOAT32_ARRAY:
-							case Variant::PACKED_INT64_ARRAY:
-							case Variant::PACKED_FLOAT64_ARRAY:
-							case Variant::PACKED_STRING_ARRAY:
-							case Variant::PACKED_VECTOR3_ARRAY:
-							case Variant::PACKED_COLOR_ARRAY:
-								default_arg_text = Variant::get_type_name(default_arg.get_type()) + "(" + default_arg_text + ")";
-								break;
-							case Variant::OBJECT:
-							case Variant::DICTIONARY:
-							case Variant::ARRAY:
-							case Variant::_RID:
-
-							default: {
-							}
-						}
-
-						_write_string(f, 3, "<argument index=\"" + itos(i) + "\" name=\"" + _escape_string(arginfo.name) + "\" type=\"" + type_name + "\" default=\"" + _escape_string(default_arg_text) + "\">");
-					} else
-						_write_string(f, 3, "<argument index=\"" + itos(i) + "\" name=\"" + arginfo.name + "\" type=\"" + type_name + "\">");
-				}
-
-				String hint;
-				switch (arginfo.hint) {
-					case PROPERTY_HINT_DIR: hint = "A directory."; break;
-					case PROPERTY_HINT_RANGE: hint = "Range - min: " + arginfo.hint_string.get_slice(",", 0) + " max: " + arginfo.hint_string.get_slice(",", 1) + " step: " + arginfo.hint_string.get_slice(",", 2); break;
-					case PROPERTY_HINT_ENUM:
-						hint = "Values: ";
-						for (int j = 0; j < arginfo.hint_string.get_slice_count(","); j++) {
-							if (j > 0) hint += ", ";
-							hint += arginfo.hint_string.get_slice(",", j) + "=" + itos(j);
-						}
-						break;
-					case PROPERTY_HINT_LENGTH: hint = "Length: " + arginfo.hint_string; break;
-					case PROPERTY_HINT_FLAGS:
-						hint = "Values: ";
-						for (int j = 0; j < arginfo.hint_string.get_slice_count(","); j++) {
-							if (j > 0) hint += ", ";
-							hint += arginfo.hint_string.get_slice(",", j) + "=" + itos((uint64_t)1 << j);
-						}
-						break;
-					case PROPERTY_HINT_FILE: hint = "A file:"; break;
-					default: {
-					}
-						//case PROPERTY_HINT_RESOURCE_TYPE: hint="Type: "+arginfo.hint_string; break;
-				};
-				if (hint != "")
-					_write_string(f, 4, hint);
-
-				_write_string(f, 3, (i == -1) ? "</return>" : "</argument>");
-			}
-
-			_write_string(f, 3, "<description>");
-			_write_string(f, 3, "</description>");
-
-			_write_string(f, 2, "</method>");
-		}
-
-		_write_string(f, 1, "</methods>");
-
-		List<MethodInfo> signal_list;
-		ClassDB::get_signal_list(name, &signal_list, true);
-
-		if (signal_list.size()) {
-
-			_write_string(f, 1, "<signals>");
-			for (List<MethodInfo>::Element *EV = signal_list.front(); EV; EV = EV->next()) {
-
-				_write_string(f, 2, "<signal name=\"" + EV->get().name + "\">");
-				for (int i = 0; i < EV->get().arguments.size(); i++) {
-					PropertyInfo arginfo = EV->get().arguments[i];
-					_write_string(f, 3, "<argument index=\"" + itos(i) + "\" name=\"" + arginfo.name + "\" type=\"" + Variant::get_type_name(arginfo.type) + "\">");
-					_write_string(f, 3, "</argument>");
-				}
-				_write_string(f, 3, "<description>");
-				_write_string(f, 3, "</description>");
-
-				_write_string(f, 2, "</signal>");
-			}
-
-			_write_string(f, 1, "</signals>");
-		}
-
-		_write_string(f, 1, "<constants>");
-
-		List<String> constant_list;
-		ClassDB::get_integer_constant_list(name, &constant_list, true);
-
-		/* constants are sorted in a special way */
-
-		List<_ConstantSort> constant_sort;
-
-		for (List<String>::Element *E = constant_list.front(); E; E = E->next()) {
-			_ConstantSort cs;
-			cs.name = E->get();
-			cs.value = ClassDB::get_integer_constant(name, E->get());
-			constant_sort.push_back(cs);
-		}
-
-		constant_sort.sort();
-
-		for (List<_ConstantSort>::Element *E = constant_sort.front(); E; E = E->next()) {
-
-			_write_string(f, 2, "<constant name=\"" + E->get().name + "\" value=\"" + itos(E->get().value) + "\">");
-			_write_string(f, 2, "</constant>");
-		}
-
-		_write_string(f, 1, "</constants>");
-		_write_string(f, 0, "</class>");
-
-		class_list.erase(name);
-	}
-
-	_write_string(f, 0, "</doc>");
-	f->close();
-	memdelete(f);
-}
diff --git a/editor/doc/doc_dump.h b/editor/doc/doc_dump.h
deleted file mode 100644
index f8f1b6f805..0000000000
--- a/editor/doc/doc_dump.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/*************************************************************************/
-/*  doc_dump.h                                                           */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-#ifndef DOC_DUMP_H
-#define DOC_DUMP_H
-
-#include "core/class_db.h"
-
-class DocDump {
-public:
-	static void dump(const String &p_file);
-};
-
-#endif // DOC_DUMP_H