dispose method

Implementation

void dispose() {
  super.lockNotifier.dispose();
  super.overlayOpacityNotifier.dispose();
  super.moreOpacityNotifier.dispose();
  super.isPlay.dispose();
  super.currentPlayingVideo.dispose();
  super.fitNotifier.dispose();
  super.speedNotifer.dispose();
  _player.dispose();
  _state.dispose();
}