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/variant_op.cpp b/core/variant_op.cpp
index b7678d8f43..1d75d52db0 100644
--- a/core/variant_op.cpp
+++ b/core/variant_op.cpp
@@ -115,6 +115,7 @@
 		TYPE(PREFIX, OP, PACKED_VECTOR3_ARRAY), \
 		TYPE(PREFIX, OP, PACKED_COLOR_ARRAY),   \
 }
+
 /* clang-format on */
 
 #define CASES(PREFIX) static const void *switch_table_##PREFIX[25][Variant::VARIANT_MAX] = { \
@@ -3536,6 +3537,7 @@ bool Variant::iter_init(Variant &r_iter, bool &valid) const {
 	valid = false;
 	return false;
 }
+
 bool Variant::iter_next(Variant &r_iter, bool &valid) const {
 	valid = true;
 	switch (type) {