added more indexing variables

msg/actuator_controls.msg

@@ -5,6 +5,9 @@ uint8 INDEX_PITCH = 1
 uint8 INDEX_YAW = 2
 uint8 INDEX_THROTTLE = 3
 uint8 INDEX_FLAPS = 4
+uint8 INDEX_SPOILERS = 5
+uint8 INDEX_AIRBRAKES = 6
+uint8 INDEX_LANDING_GEAR = 7
 uint8 GROUP_INDEX_ATTITUDE = 0
 uint64 timestamp
 uint64 timestamp_sample	    # the timestamp the data this control response is based on was sampled