asteroid claim improvements, golem ship security

Add plating over asteroid tiles if you've claimed them

Asteroid walls can now be used to define rooms (still must be airtight)

Add golem check to the free golem ship

code/modules/mining/mine_turfs.dm

@@ -522,6 +522,17 @@ var/global/list/rockTurfEdgeCache = list(
 				O.attackby(W,user)
 				return
 
+	if(istype(W, /obj/item/stack/tile/plasteel) && isarea(loc))
+		var/area/A = loc
+		if(A.outdoors)
+			to_chat(user, "<span class='warning'>You must define a room as part of the station using blueprints or an equivalent item first.</span>")
+			return
+		playsound(src, 'sound/weapons/genhit.ogg', 50, 1)
+		make_plating()
+		icon_plating = "plating"
+		icon_state = "plating"
+		update_icon()
+
 /turf/simulated/floor/plating/airless/asteroid/gets_drilled()
 	if(!dug)
 		gets_dug()