AP_Vehicles: add more ModeReasons

libraries/AP_Vehicle/ModeReason.h

@@ -56,4 +56,7 @@ enum class ModeReason : uint8_t {
   SOARING_ALT_TOO_HIGH,
   SOARING_ALT_TOO_LOW,
   SOARING_DRIFT_EXCEEDED,
+  RTL_COMPLETE_SWITCHING_TO_VTOL_LAND_RTL,
+  RTL_COMPLETE_SWITCHING_TO_FIXEDWING_AUTOLAND,
+  MISSION_CMD,
 };