Plane: use enum-class for RangeFinder Status

ArduPlane/Log.cpp

@@ -195,7 +195,7 @@ struct PACKED log_Sonar {
 void Plane::Log_Write_Sonar()
 {
     uint16_t distance = 0;
-    if (rangefinder.status_orient(ROTATION_PITCH_270) == RangeFinder::RangeFinder_Good) {
+    if (rangefinder.status_orient(ROTATION_PITCH_270) == RangeFinder::Status::Good) {
         distance = rangefinder.distance_cm_orient(ROTATION_PITCH_270);
     }
 

ArduPlane/altitude.cpp

@@ -129,7 +129,7 @@ float Plane::relative_ground_altitude(bool use_rangefinder_if_available)
    }
 
    if (use_rangefinder_if_available && quadplane.in_vtol_land_final() &&
-       rangefinder.status_orient(ROTATION_PITCH_270) == RangeFinder::RangeFinder_OutOfRangeLow) {
+       rangefinder.status_orient(ROTATION_PITCH_270) == RangeFinder::Status::OutOfRangeLow) {
        // a special case for quadplane landing when rangefinder goes
        // below minimum. Consider our height above ground to be zero
        return 0;
@@ -613,7 +613,7 @@ void Plane::rangefinder_height_update(void)
 {
     float distance = rangefinder.distance_cm_orient(ROTATION_PITCH_270)*0.01f;
     
-    if ((rangefinder.status_orient(ROTATION_PITCH_270) == RangeFinder::RangeFinder_Good) && ahrs.home_is_set()) {
+    if ((rangefinder.status_orient(ROTATION_PITCH_270) == RangeFinder::Status::Good) && ahrs.home_is_set()) {
         if (!rangefinder_state.have_initial_reading) {
             rangefinder_state.have_initial_reading = true;
             rangefinder_state.initial_range = distance;