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.

1 files changed, 2 insertions, 0 deletions

diff --git a/core/io/resource_loader.cpp b/core/io/resource_loader.cpp
index 361f40cbc6..8490cb5627 100644
--- a/core/io/resource_loader.cpp
+++ b/core/io/resource_loader.cpp
@@ -260,6 +260,7 @@ void ResourceLoader::_thread_load_function(void *p_userdata) {
 
 	thread_load_mutex->unlock();
 }
+
 Error ResourceLoader::load_threaded_request(const String &p_path, const String &p_type_hint, bool p_use_sub_threads, const String &p_source_resource) {
 	String local_path;
 	if (p_path.is_rel_path())
@@ -412,6 +413,7 @@ ResourceLoader::ThreadLoadStatus ResourceLoader::load_threaded_get_status(const
 
 	return status;
 }
+
 RES ResourceLoader::load_threaded_get(const String &p_path, Error *r_error) {
 	String local_path;
 	if (p_path.is_rel_path())