Gives filters proper names, updates airlocks to use filters

Docking ports still don't use filters though, as it would mess with the
docking ports that are also airlocks. Docking is infrequent though so it
should be fine.

code/game/machinery/embedded_controller/airlock_controllers.dm

@@ -1,6 +1,7 @@
 //base type for controllers of two-door systems
 /obj/machinery/embedded_controller/radio/airlock
 	// Setup parameters only
+	radio_filter = RADIO_AIRLOCK
 	var/tag_exterior_door
 	var/tag_interior_door
 	var/tag_airpump