public async Task JoinGame()
{
var playerEid = await _world.NewEntityId();
_player = GrainFactory.GetGrain <IPlayer>(_world.MakeEntityKey(playerEid));
await _player.SetName(_name);
await _player.BindToUser(this);
await _world.AttachEntity(_player);
_state = UserState.JoinedGame;
_keepAliveWaiters = new HashSet <uint>();
_sendKeepAliveTimer = RegisterTimer(OnSendKeepAliveRequests, null, TimeSpan.Zero, TimeSpan.FromSeconds(5));
// _worldTimeSyncTimer = RegisterTimer(OnSyncWorldTime, null, TimeSpan.Zero, )
}
