ARez

part of https://github.com/godotengine/godot/issues/43440 Includes tests for: - `InputEventMouse.set_button_mask()` and `InputEventMouse.get_button_mask()` - `InputEventMouse.set_position()` and `InputEventMouse.get_position()` - `InputEventMouse.set_global_position()` and `InputEventMouse.get_global_position()` I hope those checks are sufficient, if not please let me know...