Use local path setpoints for fixedwing position control

msg/CMakeLists.txt

@@ -195,6 +195,7 @@ set(msg_files
 	vehicle_land_detected.msg
 	vehicle_local_position.msg
 	vehicle_local_position_setpoint.msg
+	vehicle_local_path_setpoint.msg
 	vehicle_magnetometer.msg
 	vehicle_odometry.msg
 	vehicle_optical_flow.msg

msg/vehicle_local_path_setpoint.msg

@@ -0,0 +1,16 @@
+# Local position setpoint in NED frame
+# setting something to NaN means the state should not be controlled
+
+uint64 timestamp	# time since system start (microseconds)
+
+float32[2] prev_wp	# previous waypoint in meters NED
+float32 x		# in meters NED
+float32 y		# in meters NED
+float32 z		# in meters NED
+float32 vx		# in meters/sec
+float32 vy		# in meters/sec
+float32 vz		# in meters/sec
+float32 true_airspeed	# true air relative setpoint in meters/sec
+float32 curvature	# in meters/sec^2
+
+# TOPICS vehicle_local_path_setpoint