adds mappable air alarm without access restrictions

code/game/machinery/alarm.dm

@@ -1072,6 +1072,13 @@
 	if(buildstage < 1)
 		to_chat(user, "The circuit is missing.")
 
+/obj/machinery/alarm/all_access
+	name = "all-access air alarm"
+	desc = "This particular atmos control unit appears to have no access restrictions."
+	locked = FALSE
+	req_access = null
+	req_one_access = null
+
 /*
 AIR ALARM CIRCUIT
 Just an object used in constructing air alarms