Add support for SceneReference type properties in Unity Events in inspector

[Shain-Allen]

While this is minor and can be easily worked around, I did notice that when you create a method like this one

public void LoadSceneAdditive(SceneReference sceneReference)
{
      if (sceneReference.State == SceneReferenceState.Unsafe)
      {
            Debug.LogError($"scene reference is unsafe!: {sceneReference.UnsafeReason}");
            return;
      }
           
      SceneManager.LoadSceneAsync(sceneReference.BuildIndex, LoadSceneMode.Additive);
}

then in the inspector for something like a button, it doesn't show up when registering it for a unity event

again, this is a very minor issue as it's straightforward to work around with a separate script that can sit on each button to hold the ScreenReference but it would be a nice QOL thing to have added

[starikcetin]

That's interesting, I would expect it to work. I'll take a look.

[Shain-Allen]

I probably should have mentioned, I am on Unity Version 2023.2.14f1

[starikcetin]

It turns out this is a limitation of UnityEvent. It supports predefined (static) calls with primitive arguments, and arguments of type UnityEngine.Object. Since SceneReference is none of those, it can only be used with dynamic calls.

[starikcetin]

I have an idea. We will see how it goes.

[starikcetin]

I implemented a workaround in #102. It will be included in the next release.

[starikcetin]

Included in 4.1.0.