Added a new fourth button in room14 to demonstrate this.
Renamed BYPASS_LAST_SCENE to FORCE_LAST_SCENE_NULL to make it a bit clearer.
Made events "finished" and "interrupted" signals connections as ONESHOT (so they are disconnected once the signal was received).
Also removed some unused files, many others remain.
And fixed some bugs here and there.
This is done even if there is no ESC script attached to the room.
First default position will then be the start ESCLocation if there is one.
Else, fallback to origin (0,0).
