dispose method

void dispose()

Implementation

void dispose() {
  _cameraSub?.cancel();
  _cameraSub = null;
  onCameraIdle = null;
  onMapClick = null;
  onMapLongClick = null;
  onMarkerClick = null;
  onMapError = null;
  olaMapListen(id, null);
  olaMapDisposeChannel(id);
  _controllers.remove(id);
}