Wrong signature in methods like PhysicsServer3D::body_test_motion where there are default null parameters

[kulkalkul]

Comparing the two, Rust counterpart should be Option<Gd<PhysicsTestMotionResult3D>>:

https://docs.godotengine.org/en/stable/classes/class_physicsserver3d.html#class-physicsserver3d-method-body-test-motion
https://godot-rust.github.io/docs/gdext/master/godot/engine/struct.PhysicsServer3D.html#method.body_test_motion

[Bromeon]

Thanks for reporting! This looks like a duplicate of #156, as such I'm closing it.

(This not only affects default-null parameters, but generally parameters that can be null).