Keys and monsters (0.0.8)

Lots of behind the scenes cleanup, and added keys (no use yet :D) and the dreaded monster who will eat you and end the game if he winds up in the same room as you. To be honest, since I added the monster in this update, the next minor update will most likely trigger the next major update. A cleaner versioning system to come after that, I promise*.

Next minor update: Add the door out and a key required to unlock it.
Next major update: Recreate the game in full.

Changes:
*Treasure is no longer generated.
*Doorways are now Unlocked Doors, are colored white, and have the appropriate name/description.
*Did a lot of work on fixing the map actor event system. Probably still needs work.
*Added the dreaded monster, which eats you and ends the game, blows out torches, and moves randomly to a room nearby him.
*Cool items are announced when entering a room.