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.

modules/lightmapper_rd/lm_compute.glsl

@@ -36,6 +36,7 @@ layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
 layout(set = 1, binding = 0, std430) restrict buffer LightProbeData {
 	vec4 data[];
 }
+
 light_probes;
 
 layout(set = 1, binding = 1) uniform texture2DArray source_light;
@@ -93,6 +94,7 @@ layout(push_constant, binding = 0, std430) uniform Params {
 
 	mat3x4 env_transform;
 }
+
 params;
 
 //check it, but also return distance and barycentric coords (for uv lookup)