PhysicsBody now has methods move_and_collide/test_move and needed
properties for these methods: safe margin, locked axes (3D only).
Moved collision_exceptions from StaticBody to PhysicsBody for 3D
(same as 2D, and conforms to documentation).
RigidBody doesn't have test_motion method anymore, it's now redundant
with PhysicsBody.test_move.
And fixups:
- Add missing bindings in RenderingServer
- Remove duplicate ArrayMesh enum bindings (they're in Mesh already)
- Remove redundant _unhandled_key_input binding in Control (it's in Node
already)
