Implement Feature Build Profiles

This PR is a continuation of #50381 (which was implemented exactly a year ago!)

* Add a visual interface to select which classes should not be built into Godot (well, they are built if something else uses them, but if not used the optimizer will remove them out).
* Add a detection system to scan the project and figure out the actual classes used.
* Added the ability for SCons to load build profiles.

Obligatory Screen:

A simple test with a couple of nodes in the scene resulted in a 25% reduction for the final binary size

TODO:

* Script languages need to implement used class detection (left for another PR).
* Options to disable servers or server functionalities (like 2D or 3D physics, navigation, etc). Are missing, that should also greatly aid in reducing binary size.
* Options to disable some modules would be desired.
* More options to disable drivers (OpenGL, Vulkan, etc) would be desired.

In general this PR is a starting point for more contributors to improve and enhance this functionality.

1 files changed, 22 insertions, 2 deletions

diff --git a/SConstruct b/SConstruct
index 50cb43b218..94cb205918 100644
--- a/SConstruct
+++ b/SConstruct
@@ -195,7 +195,7 @@ opts.Add("extra_suffix", "Custom extra suffix added to the base filename of all
 opts.Add(BoolVariable("vsproj", "Generate a Visual Studio solution", False))
 opts.Add(BoolVariable("disable_3d", "Disable 3D nodes for a smaller executable", False))
 opts.Add(BoolVariable("disable_advanced_gui", "Disable advanced GUI nodes and behaviors", False))
-opts.Add("disable_classes", "Disable given classes (comma separated)", "")
+opts.Add("build_feature_profile", "Path to a file containing a feature build profile", "")
 opts.Add(BoolVariable("modules_enabled_by_default", "If no, disable all modules except ones explicitly enabled", True))
 opts.Add(BoolVariable("no_editor_splash", "Don't use the custom splash screen for the editor", True))
 opts.Add("system_certs_path", "Use this path as SSL certificates default for editor (for package maintainers)", "")
@@ -720,7 +720,27 @@ if selected_platform in platform_list:
 
     if env["tools"]:
         env.Append(CPPDEFINES=["TOOLS_ENABLED"])
-    methods.write_disabled_classes(env["disable_classes"].split(","))
+
+    disabled_classes = []
+
+    if env["build_feature_profile"] != "":
+        print("Using build feature profile: " + env["build_feature_profile"])
+        import json
+
+        try:
+            ft = json.load(open(env["build_feature_profile"]))
+            if "disabled_classes" in ft:
+                disabled_classes = ft["disabled_classes"]
+            if "disabled_build_options" in ft:
+                dbo = ft["disabled_build_options"]
+                for c in dbo:
+                    env[c] = dbo[c]
+        except:
+            print("Error opening feature build profile: " + env["build_feature_profile"])
+            Exit(255)
+
+    methods.write_disabled_classes(disabled_classes)
+
     if env["disable_3d"]:
         if env["tools"]:
             print(