Small Bug Fix Patch

I've pushed a small update for some bug fixes:

• Fixed a bug with the Cannon carriage which caused it to sometimes not do damage.
  
• Fixed a bug with the volume sliders which caused them to not work when operating it with a keyboard or controller. (Thanks, fodder!)
  
• Fixed a bug where the bottom mute buttons didn't update when updating the mute settings in the Options dialog. (Thanks again, fodder!)
  

Enjoy!