Merge branch 'master' of github.com:Baystation12/Baystation12 into BEF-staging
Player-controlled mice spawn next to a vent by default, spawn at MOB_LAYER, can nibble food to regain health, can pass through plastic flaps, and can climb into disposal units.

Mice cannot pull objects.
Merge pull request #2335 from RavingManiac/bleeding-edge-freeze

Mouse tweaks and improvements
Merge branch 'bleeding-edge-freeze' of github.com:Baystation12/Baystation12 into BEF
Merge branch 'master' of github.com:Baystation12/Baystation12 into BEF
Merge branch 'bleeding-edge-freeze' of https://github.com/Baystation12/Baystation12 into bleeding-edge-freeze