Attempt to fix issue #2371

- Halves drone speed
- Copied over the exact values from space-carp for spaceproofness, though it should already have worked before
- Untested(whooo uni)
Fixes issue #2367

Even characters created before nt_relation option now get to choose.
Fixes issue #2363

Maptools now points to the right map again.
Fix to issue #2371

Increased the simple_animal/hostile/move_to_delay, which seems to be an entirely separate value for speed. This code is so messed up.
Fixed problem where hostile animals would attack even the dead.
Players have to wait 5 minutes between dying as a mouse and respawning as a mouse. Global variable mouse_respawn_time determines the respawn time in minutes.

Mice can no longer open airlocks.

Mice can no longer strip items from humans

Mice can no longer put other creatures into disposal units (though they can still climb into disposal units)

Message for when mice crawl into vents removed. Mouse nibbling message only displayed to observers half the time.
Some uses of ismouse() replaced with isanimal()

world.time used to calculate mouse spawn timer.

Spawn timer now applies to being killed via splat().
Added var/small to mobs, which currently only handles if they can open airlocks. This replaces the use of ismouse().
Merge pull request #2376 from RavingManiac/master

Stopped the mousepocalypse
Moved doors to medical lobby to match doors from lobby to main part, for better flow.
Merge pull request #2373 from CIB/master

Several bugfixes
Merge branch 'master' of https://github.com/Baystation12/Baystation12 into bleeding-edge-freeze