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
Increases Syndicate Bomb cost to 6TC

In the interest of cutting down on the same tired pair of telecoms and SMES bombings, I'd like to increase syndicate bomb costs to 6, so they can only buy one.
Fixes a radio runtime.
Fixes CC64K Poster

NOW LESS EYE SEAR MAYBE?
Merge pull request #4636 from Miauw62/woopwoop

Fixes a radio runtime.
Mail Order Corporate Posters

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

NT Poster Port
Merge pull request #4621 from Ikarrus/bombsto6

Increases Syndicate Bomb cost to 6TC