convert precland to flight task

msg/CMakeLists.txt

@@ -122,13 +122,14 @@ set(msg_files
 	orbit_status.msg
 	parameter_update.msg
 	ping.msg
-	pps_capture.msg
 	position_controller_landing_status.msg
 	position_controller_status.msg
 	position_setpoint.msg
 	position_setpoint_triplet.msg
 	power_button_state.msg
 	power_monitor.msg
+	pps_capture.msg
+	precision_landing_status.msg
 	pwm_input.msg
 	px4io_status.msg
 	radio_status.msg

msg/precision_landing_status.msg

@@ -0,0 +1,10 @@
+# ORBIT_YAW_BEHAVIOUR
+uint8 PRECLAND_STATE_START = 0
+uint8 PRECLAND_STATE_HORIZONTAL_APPROACH = 1
+uint8 PRECLAND_STATE_DESCEND_ABOVE_TARGET = 2
+uint8 PRECLAND_STATE_FINAL_APPROACH = 3
+uint8 PRECLAND_STATE_SEARCH = 4
+uint8 PRECLAND_STATE_FALLBACK = 5
+
+uint64 timestamp 	# time since system start (microseconds)
+uint8 precland_state    # Radius of the orbit circle. Positive values orbit clockwise, negative values orbit counter-clockwise. [m]