Minor tweaks and fixes for airlock equipment

- Fixed DP vent pumps not changing direction
- Made airlock_sensor more versatile (and backwards compatible with old airlock code)
- Added airlock_sensor and access_button airlock subtypes for easier mapping

code/ATMOSPHERICS/components/binary_devices/dp_vent_pump.dm

@@ -154,8 +154,8 @@
 		if("power_toggle" in signal.data)
 			on = !on
 
-		if("set_direction" in signal.data)
-			pump_direction = text2num(signal.data["set_direction"])
+		if("direction" in signal.data)
+			pump_direction = text2num(signal.data["direction"])
 
 		if("checks" in signal.data)
 			pressure_checks = text2num(signal.data["checks"])

code/game/machinery/airlock_control.dm

@@ -124,7 +124,8 @@ obj/machinery/airlock_sensor
 
 	var/id_tag
 	var/master_tag
-	var/frequency = 1449
+	var/frequency = 1379
+	var/command = "cycle"
 
 	var/datum/radio_frequency/radio_connection
 
@@ -145,7 +146,7 @@ obj/machinery/airlock_sensor/attack_hand(mob/user)
 	var/datum/signal/signal = new
 	signal.transmission_method = 1 //radio signal
 	signal.data["tag"] = master_tag
-	signal.data["command"] = "cycle"
+	signal.data["command"] = command
 
 	radio_connection.post_signal(src, signal, range = AIRLOCK_CONTROL_RANGE, filter = RADIO_AIRLOCK)
 	flick("airlock_sensor_cycle", src)
@@ -183,7 +184,11 @@ obj/machinery/airlock_sensor/New()
 		set_frequency(frequency)
 
 
+obj/machinery/airlock_sensor/airlock_interior
+	command = "cycle_interior"
 
+obj/machinery/airlock_sensor/airlock_exterior
+	command = "cycle_exterior"
 
 obj/machinery/access_button
 	icon = 'icons/obj/airlock_machines.dmi'
@@ -238,4 +243,12 @@ obj/machinery/access_button/New()
 	..()
 
 	if(radio_controller)
-		set_frequency(frequency)
+		set_frequency(frequency)
+
+obj/machinery/access_button/airlock_interior
+	frequency = 1379
+	command = "cycle_interior"
+
+obj/machinery/access_button/airlock_exterior
+	frequency = 1379
+	command = "cycle_exterior"