transition alignment will force heading now and go to RTL if it cannot reach it in time, handle mission failure correctly, reset after mission update, issue message with actual problem

src/modules/navigator/navigation.h

@@ -105,6 +105,7 @@ struct mission_item_s {
 	unsigned do_jump_current_count;	/**< count how many times the jump has been done	*/
 	float params[7];		/**< array to store mission command values for MAV_FRAME_MISSION ***/
 	int8_t frame;			/**< mission frame ***/
+	bool force_heading;		/**< heading needs to be reached ***/
 };
 #pragma pack(pop)
 #include <uORB/topics/mission.h>