Fixes#7261
Fixes placed posters being visible on both sides of the wall.
Fixes the poster_type var used to specify certain poster designs on the
map not working correctly, and makes the nuke op shuttle poster an
actual poster.
Poster placement now belongs to the poster object instead of turf/simulated/
Posters can now be placed on unsimulated and shuttle walls.
Adjusts the shuttle to incorporate a nice, 2-tile wide docking hatch.
Drops the viro/xenobio docking arm.
Adds a button so that the teleporter blast door can be operated
independently of the airlock blast door.
Fixes some leftover arrivals area just hanging around in space.
Adds a poster specifically for the nuke ops shuttle.
These are new posters for more postery goodness. Credits for the sprites
go to Nienhaus.
For the sprites of the poster go to http://puu.sh/5QlUx.dmi
2 posters are not included: 6th and 7th due to reasons.
* Add dynamic loading of poster designs (untick group in DM to remove, no more toggles)
* Fixes wirecutters duping posters
* Fixes dropped posters not being placeable.
