Delegate declaration for the OnUnload event.
Unload for more information
public delegate void OnUnloadDelegateHandler(ulong clientId, string sceneName, AsyncOperation asyncOperation);
|System.UInt64||clientId||the client that is processing this event (the server will receive all of these events for every client and itself)|
|System.String||sceneName||name of the scene being processed|
|AsyncOperation||asyncOperation||the associated that can be used for scene unloading progress|