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/scene/2d/back_buffer_copy.cpp b/scene/2d/back_buffer_copy.cpp
index 0bcb42e563..a36e0a86e1 100644
--- a/scene/2d/back_buffer_copy.cpp
+++ b/scene/2d/back_buffer_copy.cpp
@@ -72,6 +72,7 @@ void BackBufferCopy::set_copy_mode(CopyMode p_mode) {
 	copy_mode = p_mode;
 	_update_copy_mode();
 }
+
 BackBufferCopy::CopyMode BackBufferCopy::get_copy_mode() const {
 	return copy_mode;
 }
@@ -96,5 +97,6 @@ BackBufferCopy::BackBufferCopy() {
 	copy_mode = COPY_MODE_RECT;
 	_update_copy_mode();
 }
+
 BackBufferCopy::~BackBufferCopy() {
 }