Editor Asset Reference enhancements

It would be useful in the editor asset view to have some additional “asset reference” features.

For example:

  • A view to show all referenced assets in the the scene from the whole asset hierarchy.
    – in this view clicking an asset would show the location of the asset in the hierarchy view.

  • A similar view to show all the unreferenced assets in the scene

  • A method to see which scenes an asset is referenced in.