Added Geese to enemies that spawn

- Game now spawns geese for enemy waves
- Edited AI_Manager so that it takes in geese to spawn
- Edited Duck script (now Bird) so that it takes in different species
like geese
- User is only allowed to shoot ducks, what this means is that if the
user hits a goose 1000 points is deducted.
- Edited duck model so that different materials can be attachted. Now
there are two prefabs, one being a goose (goose colors) one being a
duck (duck colors).
- Added a canadian geese sound so when a goose is shot it does not make
a duck sound but a goose sound.
- Added geese materials to project to decorate goose
- Added new animation for goose flying. A little slower and has a pause
in between
- To figure out what is a goose and what is a duck, a duck flaps its
wings quicker, no pause while flapping its wings, a duck is half the
size of a goose (Duck is (1,1,1) Goose is (2,2,2)), and duck has
different colors then a goose.
- Added different tag system for birds. Bird wave is either classified
as "Bird Single" (meaning only one bird in wave) or "Bird Group"
(meaning multiple birds in wave, can be 2+ birds in wave). Each
individual bird has the tag "Bird" as well.
- Can tell if the bird is a duck or goose by checking public enum.