Fix for 3D-physics processing:
- with enabled input_capture_on_drag now report correct position and
normals in _input_event
- mouse_enter and mouse_exit signals are emitted when the mouse cursor
leaves the visible area of the 3D-object, independently of pressed mouse
button or input_capture_on_drag
- make sure that collision input events are sent in the right order with
respect to mouse_enter and mouse_exit signals
35956d9128