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.

2 files changed, 2 insertions, 0 deletions

diff --git a/modules/bullet/rigid_body_bullet.cpp b/modules/bullet/rigid_body_bullet.cpp
index 69a81f6f15..f263893287 100644
--- a/modules/bullet/rigid_body_bullet.cpp
+++ b/modules/bullet/rigid_body_bullet.cpp
@@ -555,6 +555,7 @@ void RigidBodyBullet::set_mode(PhysicsServer3D::BodyMode p_mode) {
 	btBody->setAngularVelocity(btVector3(0, 0, 0));
 	btBody->setLinearVelocity(btVector3(0, 0, 0));
 }
+
 PhysicsServer3D::BodyMode RigidBodyBullet::get_mode() const {
 	return mode;
 }
diff --git a/modules/bullet/slider_joint_bullet.cpp b/modules/bullet/slider_joint_bullet.cpp
index c248b78acf..6d5d95d07a 100644
--- a/modules/bullet/slider_joint_bullet.cpp
+++ b/modules/bullet/slider_joint_bullet.cpp
@@ -119,6 +119,7 @@ real_t SliderJointBullet::getLowerLinLimit() const {
 void SliderJointBullet::setLowerLinLimit(real_t lowerLimit) {
 	sliderConstraint->setLowerLinLimit(lowerLimit);
 }
+
 real_t SliderJointBullet::getUpperLinLimit() const {
 	return sliderConstraint->getUpperLinLimit();
 }