vtol fixes:

- mc pos control: publish attitude setpoint when vtol is in trans mode
- fw att control: do not publish attitude setpoint when in transition mode
- introduce flag in_transition_mode in vehicle status message for vtol
- improve tiltrotor code based on flight testing

src/modules/commander/commander.cpp

@@ -1498,6 +1498,7 @@ int commander_thread_main(int argc, char *argv[])
 			/* Make sure that this is only adjusted if vehicle really is of type vtol*/
 			if (is_vtol(&status)) {
 				status.is_rotary_wing = vtol_status.vtol_in_rw_mode;
+				status.in_transition_mode = vtol_status.vtol_in_trans_mode;
 			}
 		}