Patch of demo: hiding mouse cursor, default controller input configuration — icosi-do Steam update #103902

Just another small patch of the demo: The mouse cursor is now hidden when you don't use the mouse. There is now a default controller input configuration (generic gamepad). The menu (three lines) button of the Xbox controller is now switching between the menu and the puzzle (same as the view button on the controller and the escape key). The larger changes to the game are regarding statistics and achievements - but those are not active in the demo.