Small QoL Update

I decided it was about time I cleaned this up and made it more presentable.

Changes

• Improved balance
• Added a new weapon
• Added some new sound effects and ambiance
• Added a simple UI
• Redid the dialog system
• Player swaps between a couple different looks
  (This was originally planned, but was never implemented)

Fixes

• Fixed player getting stuck in walls
• Capped weapon firerate
• Fixed music disappearing when esc pressed
• End screen is now reachable