convert precland to flight task

msg/CMakeLists.txt

@@ -146,6 +146,7 @@ set(msg_files
 	PowerButtonState.msg
 	PowerMonitor.msg
 	PpsCapture.msg
+	precision_landing_status.msg
 	PwmInput.msg
 	Px4ioStatus.msg
 	QshellReq.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]