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/image.cpp b/core/image.cpp
index 4cbecbf44f..3fff93ed91 100644
--- a/core/image.cpp
+++ b/core/image.cpp
@@ -2283,6 +2283,7 @@ Error Image::decompress() {
 Error Image::compress(CompressMode p_mode, CompressSource p_source, float p_lossy_quality) {
 	return compress_from_channels(p_mode, detect_used_channels(p_source), p_lossy_quality);
 }
+
 Error Image::compress_from_channels(CompressMode p_mode, UsedChannels p_channels, float p_lossy_quality) {
 	switch (p_mode) {
 		case COMPRESS_S3TC: {
@@ -3359,6 +3360,7 @@ void Image::convert_rg_to_ra_rgba8() {
 		w[i + 2] = 0;
 	}
 }
+
 void Image::convert_ra_rgba8_to_rg() {
 	ERR_FAIL_COND(format != FORMAT_RGBA8);
 	ERR_FAIL_COND(!data.size());