add minimal pitch field to mission item

src/modules/uORB/topics/mission.h

@@ -89,6 +89,7 @@ struct mission_item_s
 	enum NAV_CMD nav_cmd;		/**< navigation command					*/
 	float radius;			/**< radius in which the mission is accepted as reached in meters */
 	float time_inside;		/**< time that the MAV should stay inside the radius before advancing in seconds */
+	float pitch_min;		/**< minimal pitch angle for fixed wing takeoff waypoints */
 	bool autocontinue;		/**< true if next waypoint should follow after this one */
 	int index;			/**< index matching the mavlink waypoint                */
 	enum ORIGIN origin;		/**< where the waypoint has been generated		*/