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, 1 insertions, 0 deletions

diff --git a/core/math/octree.h b/core/math/octree.h
index 0782a39804..067103112d 100644
--- a/core/math/octree.h
+++ b/core/math/octree.h
@@ -1218,6 +1218,7 @@ void Octree<T, use_pairs, AL>::set_pair_callback(PairCallback p_callback, void *
 	pair_callback = p_callback;
 	pair_callback_userdata = p_userdata;
 }
+
 template <class T, bool use_pairs, class AL>
 void Octree<T, use_pairs, AL>::set_unpair_callback(UnpairCallback p_callback, void *p_userdata) {
 	unpair_callback = p_callback;