Redundant update out of paranoia

Fixed a bug where a couple other biomes would spawn toxic gas everywhere. CrabTown is safe once again.

Changed how the fog works due to problems with nearby settlements getting suffocated. Also now the guards of Narko's Trap wear fog masks.

Updated AI behaviors of the creepy thing. Updated the creepy thing's stats. Updated the probabilities of spawning creepy things (and other stuff). Updated the name of the creepy thing.