Style: Enforce separation line between function definitions

I couldn't find a tool that enforces it, so I went the manual route:
```
find -name "thirdparty" -prune \
  -o -name "*.cpp" -o -name "*.h" -o -name "*.m" -o -name "*.mm" \
  -o -name "*.glsl" > files
perl -0777 -pi -e 's/\n}\n([^#])/\n}\n\n\1/g' $(cat files)
misc/scripts/fix_style.sh -c
```

This adds a newline after all `}` on the first column, unless they
are followed by `#` (typically `#endif`). This leads to having lots
of places with two lines between function/class definitions, but
clang-format then fixes it as we enforce max one line of separation.

This doesn't fix potential occurrences of function definitions which
are indented (e.g. for a helper class defined in a .cpp), but it's
better than nothing. Also can't be made to run easily on CI/hooks so
we'll have to be careful with new code.

Part of #33027.

4 files changed, 11 insertions, 0 deletions

diff --git a/core/os/dir_access.cpp b/core/os/dir_access.cpp
index 520968c9a9..5763c74862 100644
--- a/core/os/dir_access.cpp
+++ b/core/os/dir_access.cpp
@@ -45,6 +45,7 @@ String DirAccess::_get_root_path() const {
 			return "";
 	}
 }
+
 String DirAccess::_get_root_string() const {
 	switch (_access_type) {
 		case ACCESS_RESOURCES:
diff --git a/core/os/file_access.cpp b/core/os/file_access.cpp
index f31842bcae..8b13e53812 100644
--- a/core/os/file_access.cpp
+++ b/core/os/file_access.cpp
@@ -170,6 +170,7 @@ uint16_t FileAccess::get_16() const {
 
 	return res;
 }
+
 uint32_t FileAccess::get_32() const {
 	uint32_t res;
 	uint16_t a, b;
@@ -187,6 +188,7 @@ uint32_t FileAccess::get_32() const {
 
 	return res;
 }
+
 uint64_t FileAccess::get_64() const {
 	uint64_t res;
 	uint32_t a, b;
@@ -394,6 +396,7 @@ void FileAccess::store_16(uint16_t p_dest) {
 	store_8(a);
 	store_8(b);
 }
+
 void FileAccess::store_32(uint32_t p_dest) {
 	uint16_t a, b;
 
@@ -407,6 +410,7 @@ void FileAccess::store_32(uint32_t p_dest) {
 	store_16(a);
 	store_16(b);
 }
+
 void FileAccess::store_64(uint64_t p_dest) {
 	uint32_t a, b;
 
diff --git a/core/os/main_loop.cpp b/core/os/main_loop.cpp
index 7c00af8d1f..1ce49b544b 100644
--- a/core/os/main_loop.cpp
+++ b/core/os/main_loop.cpp
@@ -65,12 +65,14 @@ void MainLoop::init() {
 	if (get_script_instance())
 		get_script_instance()->call("_initialize");
 }
+
 bool MainLoop::iteration(float p_time) {
 	if (get_script_instance())
 		return get_script_instance()->call("_iteration", p_time);
 
 	return false;
 }
+
 bool MainLoop::idle(float p_time) {
 	if (get_script_instance())
 		return get_script_instance()->call("_idle", p_time);
diff --git a/core/os/os.cpp b/core/os/os.cpp
index 02d1dfe895..4414b582bd 100644
--- a/core/os/os.cpp
+++ b/core/os/os.cpp
@@ -82,15 +82,18 @@ String OS::get_iso_date_time(bool local) const {
 uint64_t OS::get_splash_tick_msec() const {
 	return _msec_splash;
 }
+
 uint64_t OS::get_unix_time() const {
 	return 0;
 };
 uint64_t OS::get_system_time_secs() const {
 	return 0;
 }
+
 uint64_t OS::get_system_time_msecs() const {
 	return 0;
 }
+
 void OS::debug_break(){
 
 	// something
@@ -224,6 +227,7 @@ bool OS::is_no_window_mode_enabled() const {
 int OS::get_exit_code() const {
 	return _exit_code;
 }
+
 void OS::set_exit_code(int p_code) {
 	_exit_code = p_code;
 }