Alpha Release 0.3.1

Updates:

• Improved performance of doors.
• Added a loot chest outside of the windmill.
• Added a spawning animation for loot drops.
• Added a prompt if there's an update available. (This won't be visible until the next patch.)

Bug fixes:

Fixed the following issues:

• A graphical glitch that caused doors to rapidly alternate between opening and closing.
• Knockback effects weren't pushing back their target the correct distance.
• The player would interact, pick up, and attack things prematurely when moving toward them.