Demo Update 0.5.3

A small update that adds numpad support and fixes some minor issues:

• Added support for diagonal movement via numpad.
  
• Fixed an issue with range calculation on bow weapon attacks.
  
• Fixed some issues with camera scrolling and its responsiveness.
  
• Fixed a rare bug where stamina could drop below 0 and you couldn't use weapon attacks anymore.
  
• Fixed character walking animation on very high framerates (>60).