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_program.dm

@@ -265,7 +265,7 @@
 	var/datum/signal/signal = new
 	signal.data["tag"] = tag
 	signal.data["command"] = command
-	post_signal(signal)
+	post_signal(signal, RADIO_AIRLOCK)
 
 /datum/computer/file/embedded_program/airlock/proc/signalPump(var/tag, var/power, var/direction, var/pressure)
 	var/datum/signal/signal = new