added abductor airlocks from /tg/
station2 airlocks have a solid version, added external maintenance airlocks
added airlocks to RCD
survival pod airlocks have a solid version
door assemblies have examine hints, give more feedback, use overlays, mineral assemblies can have glass installed, use deconstruct() proc
multi tile airlocks have a solid version
moved airlock-specific procs to airlock_types.dm
airlocks use overlays now
airlocks use deconstruct() proc
map edits done to ensure nothing changes
some old airlock icons kept in due to use as /door/unpowered by away missions
airlocks open faster, delays between frames of icon states halved
added isshade() and isconstruct() helpers
cult airlocks will show their overlay
fixes plasteel material amount
9312f1fb7d