Alpha 36 hotfix 2

This patch fixes the biggest issues with the most recent release. Big thanks to everyone for reporting bugs and being patient with me!

• Fixed a bug that prevented the game from launching after modifying keybindings.
  
• Fixed a bug that broke pathfinding across Z-levels.
  
• Fixed a crash caused by drag and dropping prisoners on the map while they were still outside the home map.
  
• Fixed a Z-level scrolling crash.
  
• Doors and gates can now be built outside without requiring the "building interior" tiles being placed first.