Changes DF to be like the Mouse Guard world.

Everything will eat you.

Mouse Guard mod version 1.1 - 1.2 will have graphics set hopefully.

Fixes:
Body types of pets, birds
Squirrels now more homicidal
Adventurer mode: Can now play as weasels and vampire bats with skills
Fixed weasels rarely not being hostile to mice
Town mice now more aggressive to Mouse Guard (black axe revolt)
Fixed issue with making arrows
Plump helmet seeds always spawn.
Removed large camels from pet buying
and other minor fixes