Keepers [Don't Merge]

Keepers second draft. Still plenty left to do. Wildly untested and unfinished. Lots of quick code.
Features right now are:
* Two hands that work as human hands do (or monkey hands, to be more accurate. They can't use computers.)
* Binary speech only.
* Vent crawling.
* All access.
* Basic hud.
* Laws, yo
* Keeper cannibalism.

Still need to add spawning and emagging. Maybe more stuff with speech. Maybe tools and shit.

Minor refactoring of proc/swap_hand(), definition is moved to /mob.
Adjustments to hotkeys.
Added var/access_card to simple_animal, they can now utilize access.