paused property
Returns is the engine if currently paused or running
Implementation
bool get paused => _paused;Pauses or resume the engine
Implementation
set paused(bool value) {
  _paused = value;
  final gameLoop = _gameRenderBox?.gameLoop;
  if (gameLoop != null) {
    if (value) {
      gameLoop.stop();
    } else {
      gameLoop.start();
    }
  }
}