commander and navigator: lot's of changes, failsafe handling in commander, navigator only for execution (WIP)

src/modules/uORB/topics/position_setpoint_triplet.h

@@ -74,14 +74,13 @@ struct position_setpoint_s
 };
 
 typedef enum {
-	NAV_STATE_NONE_ON_GROUND = 0,
-	NAV_STATE_NONE_IN_AIR,
-	NAV_STATE_AUTO_ON_GROUND,
-	NAV_STATE_LOITER,
-	NAV_STATE_MISSION,
-	NAV_STATE_RTL,
-	NAV_STATE_LAND,
-	NAV_STATE_MAX
+	NAV_STATE_MANUAL = 0,
+	NAV_STATE_POSCTL,
+	NAV_STATE_AUTO,
+	NAV_STATE_RC_LOSS,
+	NAV_STATE_DL_LOSS,
+	NAV_STATE_TERMINATION,
+	MAX_NAV_STATE
 } nav_state_t;
 
 /**