parrots and simple animals

makes crackers garbage collect, and parrots drop crackers when they don't drop it gently.

added a directory of parrot snowflake code

Parrots can now hear from their headsets!

Fixed a problem with parrots not taking damage from simple animals. Rest in peace, robust god.

tweaks parrots a tiny bit, fixes most of the oversights that nodrak pointed out.

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 but cannot hear their headsets.

simple_animals now return after using healing items on them, they will also ignore ointment as simple animals only take brute damage.