Adds a ton of costumes and fixes some

There's a lot here, forgive me if I miss some.

Abed - Drunk (Communication Studies)
Annie - German Dirndl (Alternative History of the German Invasion)
Britta - White Michael Jackson (Contemporary Impressionists)
Jeff - Darkest Timeline (Remedial Chaos Theory), Proving a Point (Alternative History of the German Invasion)
Pierce - Mad Scientist (Horror Fiction in Seven Spooky Steps)
Shirley - Finally Be Fine (Biology 101)
Troy - Zombie (Epidemiology)
Garrett - Camo Jammies (Digital Exploration of Interior Design)
Vicki - Chess Knight (Curriculum Unavailable)

Also fixed a few errors on a few Jeff costumes.

...And this is only part one of said costume dump.