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...

### Problem statement When I open my project, regardless which screen was selected when I last used it, it always opens the LimboAI screen. I am not sure if theres...