moveItem method
Move queue item x up/down the queue.
Implementation
Future<void> moveItem(String queueId, String queueItemId, {int posShift = 1}) async {
await _client.sendCommand(
'player_queues/move_item',
args: {'queue_id': queueId, 'queue_item_id': queueItemId, 'pos_shift': posShift},
);
}