On Accuracy Changed Listener
fun interface OnAccuracyChangedListener<T : BaseLevelingEstimator2<T, L1, L2>, L1 : BaseLevelingEstimator2.OnLevelingAvailableListener<T, L1, L2>, L2 : BaseLevelingEstimator2.OnAccuracyChangedListener<T, L1, L2>>
Interface to notify when sensor (either accelerometer or gravity) accuracy changes.