KeeperRL Alpha30 hotfix patch is out

This patch fixes some of the most common crashes and other bugs.

• 64-bit Windows gets a native 64-bit build to avoid hitting the memory limit of 32-bit programs.
  
• Fixed the "Keeper in danger" warning in the turn-based mode.
  
• Removed the limit of 30000 dug out tiles.
  
• Added an option to perform operations such as loading, saving and world generation on the same thread in order to debug issues with very long saving/loading times. (Please get in touch if you experience unreasonably long saving/loading times)
  
• AI Fighters with restricted movement (immobile, tied up, etc) will not be sent out in raids.
  
• Fixed crash caused by a creature dying when teleported by the Audience effect.
  
• Fixed crash when paying for items while blind.
  
• Added diagnostics to figure out another crash.
  
• Fixed some typos and building descriptions.