Adds WJ's blastdoor sprites. Shutter and blastdoors are now in separate .dmis.
Updates blastdoor and shutter code to reduce duplication. Standardised, as usual.

Moves var/autoclose and proc/autoclose() from /obj/machinery/door to /obj/machinery/door/airlock, which is the only thing that uses it.

Fixes capitalisation on a bunch of default airlock names.

Comments out /obj/machinery/door/poddoor/filler_object.

UPDATES THE MAP! Holy shit this took forever please don't make me redo the map changes. All open instances now use the /preopen type.
Merge branch 'master' of github.com:tgstation/-tg-station into blastdoors

Conflicts:
	maps/tgstation.2.1.2.dmm
Added changes from #322
Merge pull request #335 from Petethegoat/blastdoors

[MAP] Adds WJ's blastdoor sprites, recodes blast doors.