Bugfixing: Machine power, golem spawns, doubletraitors.
Created by: ComicIronic
DOES fix #3663 (closed) - wrenching and unwrenching now hook into power code. Fixed2work also does something.
SHOULD fix #3670 (closed) - forceMove calls the Entered proc, so mobs should have gravity applied properly. SHOULD fix #2277 (closed), #3846 (closed) - double agent ought tog fail if there's only one traitor candidate now