fixes a ton of stuff with parrots

and also some stuff with simple animals

parrots now eat crackers
parrots now use attack_animal instead of snowflake attack code
parrots toggle between harmless and aggressive, player parrots can do this with a verb
player parrots can use headsets. fixes issue #686
fixes unreported issue of parrots being immune to simple animal attacks

simple_animals now return after using healing items on them, they will also ignore ointment as simple animals only take brute damage. fixes issue #556
simple animals cant emote after death. fixes issue # 557