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, 4 insertions, 0 deletions

diff --git a/servers/physics_3d/joints/generic_6dof_joint_3d_sw.cpp b/servers/physics_3d/joints/generic_6dof_joint_3d_sw.cpp
index 77e6eacb69..97310a5924 100644
--- a/servers/physics_3d/joints/generic_6dof_joint_3d_sw.cpp
+++ b/servers/physics_3d/joints/generic_6dof_joint_3d_sw.cpp
@@ -623,6 +623,7 @@ void Generic6DOFJoint3DSW::set_flag(Vector3::Axis p_axis, PhysicsServer3D::G6DOF
 			break; // Can't happen, but silences warning
 	}
 }
+
 bool Generic6DOFJoint3DSW::get_flag(Vector3::Axis p_axis, PhysicsServer3D::G6DOFJointAxisFlag p_flag) const {
 	ERR_FAIL_INDEX_V(p_axis, 3, 0);
 	switch (p_flag) {
diff --git a/servers/physics_3d/joints/hinge_joint_3d_sw.cpp b/servers/physics_3d/joints/hinge_joint_3d_sw.cpp
index a77d78ccaa..a879b4ca7f 100644
--- a/servers/physics_3d/joints/hinge_joint_3d_sw.cpp
+++ b/servers/physics_3d/joints/hinge_joint_3d_sw.cpp
@@ -360,12 +360,14 @@ void HingeJoint3DSW::solve(real_t p_step) {
 		}
 	}
 }
+
 /*
 void	HingeJointSW::updateRHS(real_t	timeStep)
 {
 	(void)timeStep;
 
 }
+
 */
 
 static _FORCE_INLINE_ real_t atan2fast(real_t y, real_t x) {
@@ -459,6 +461,7 @@ void HingeJoint3DSW::set_flag(PhysicsServer3D::HingeJointFlag p_flag, bool p_val
 			break; // Can't happen, but silences warning
 	}
 }
+
 bool HingeJoint3DSW::get_flag(PhysicsServer3D::HingeJointFlag p_flag) const {
 	switch (p_flag) {
 		case PhysicsServer3D::HINGE_JOINT_FLAG_USE_LIMIT: