Add uORB messages for bezier curve trajectories

msg/vehicle_trajectory_bezier.msg

@@ -0,0 +1,18 @@
+# Vehicle Waypoints Trajectory description. See also MAVLink MAV_TRAJECTORY_REPRESENTATION msg
+# The topic vehicle_trajectory_bezier is used to send a smooth flight path from the
+# companion computer / avoidance module to the position controller.
+
+uint64 timestamp		# time since system start (microseconds)
+
+uint8 POINT_0 = 0
+uint8 POINT_1 = 1
+uint8 POINT_2 = 2
+uint8 POINT_3 = 3
+uint8 POINT_4 = 4
+
+uint8 NUMBER_POINTS = 5
+
+trajectory_bezier[5] control_points
+uint8 bezier_order
+
+# TOPICS vehicle_trajectory_bezier