Demo Hotfix 1.1.1

This hotfix mostly addresses some balance issues, among other things.

Full list of changes for 1.1.1:

• Rebalanced maximum enemy attack distances - the attack distance has been reduced substantially on Oberleutnant (Medium) difficulty and below, while the distance has been reduced slightly for General (Hard) and above
  
• Rebalanced the Trenchgun - it now does slightly less damage per-pellet, but has much greater accuracy than before
  
• Fixed a number of imprecise hitboxes for both enemies and environment objects
  
• Reworked the audio player code to be more efficient
  
• Spiced up the menu screen background a bit