NT Poster Port

-Adds all them NTstation posters and the poster subtype system.
Okay yeah some changes

Error posters link to /tg/ issues page now.
Also syndie revolvers have 7 shots so yeah change because facts
Fixes CC64K Poster

NOW LESS EYE SEAR MAYBE?
Mail Order Corporate Posters

Whoops forgot about this bit.
Merge pull request #4583 from JStheguy/master

NT Poster Port