Review objects state export

def _json_default(self, obj: Any) -> Any:
	if isinstance(obj, Action):
		return self._export_action(obj)
	if isinstance(obj, Engine):
		return self._export_engine(obj)
	if isinstance(obj, Notification):
		return self._export_notification(obj)
	if isinstance(obj, StateRow):
		return self._export_state(obj)
	if isinstance(obj, Worker):
		return self._export_worker(obj)
	return obj