GameSceneManager changes to handle the OnReady event of the SceneSpawner

GameSceneManager.cs

  public void OnSpawnerReady(bool finishedSceneSetup)
  {
      // scene has not been set up. spawn a car for the local player.
      if (!finishedSceneSetup)
      {
          // assign different spawn point for the host player and the other players in the room
          // This is okay for this tutorial as we only have 2 players in a room and we are not handling host migration.
          // To properly assign spawn points, you should use GameDataManger or custom room data.
          if (NetworkClient.Instance.IsHost)
          {
              NetworkClient.Instance.LastSpawner.SpawnForPlayer(0, 1);
          }
          else
          {
              NetworkClient.Instance.LastSpawner.SpawnForPlayer(0, 0);
          }

          // tells the SceneSpawner the local player has finished scene setup.
          NetworkClient.Instance.LastSpawner.PlayerFinishedSceneSetup();
      }
  }