airlock assembly states have defines, removed redundant door layer defines

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

code/modules/mining/mine_items.dm

@@ -373,14 +373,21 @@
 
 //Door
 /obj/machinery/door/airlock/survival_pod
-	icon = 'icons/obj/doors/survival.dmi'
+	icon = 'icons/obj/doors/airlocks/survival/survival.dmi'
+	overlays_file = 'icons/obj/doors/airlocks/survival/survival_overlays.dmi'
 	assemblytype = /obj/structure/door_assembly/door_assembly_pod
-	opacity = 0
-	glass = 1
+
+/obj/machinery/door/airlock/survival_pod/glass
+	opacity = FALSE
+	glass = TRUE
 
 /obj/structure/door_assembly/door_assembly_pod
-	base_icon_state = "survival_pod"
-	glass_type = "/survival_pod"
+	name = "pod airlock assembly"
+	icon = 'icons/obj/doors/airlocks/survival/survival.dmi'
+	base_name = "pod airlock"
+	overlays_file = 'icons/obj/doors/airlocks/survival/survival_overlays.dmi'
+	airlock_type = /obj/machinery/door/airlock/survival_pod
+	glass_type = /obj/machinery/door/airlock/survival_pod/glass
 
 //Windoor
 /obj/machinery/door/window/survival_pod