Demo Bugfixes & Improvements

bugfix: music now loops properly, in some instances songs were transitioning too early
bugfix: solved issues with some ultrawide/widerscreen resolutions not displaying properly
bugfix: disabling screenshake did not affect some interactions in the hall of relics
bugfix: fixed some instances of the game becoming unresponsive in the background
improvement: all resolutions supported by the monitor should now be selectable
improvement: borderless fullscreen mode by default
improvement: game music keeps on running when the game is backgrounded