Misc fixes and improvements

Fixes
• Falling through floor fix (please report if still happening)
  
• Prevent key from falling through map (Forge lava pit for example)
  
• Ranged attack kills achievement fix
  
• Physics interactions should be more stable than previously with low end PC specs
  
  Improvements
• Mouse thumb keys support for rebind
  
• Invert camera X option added
  
• Player HUD visibility options added
  
• Brightness slider added
  
• Adjusted Steadfast Warden attack animations
  
• Adjusted font sizes in some UI elements
  

Thanks to everyone that helped report and track bugs that we're present in the game, it's a huge help for us.