More Document Namespace Helper Types

[LukeAbby]

The now deprecated ConfiguredSheetClass, ObjectClass, and LayerClass are all being namespaced.

It'd be helpful to have stuff like Item.SheetClass or AmbientLight.LayerClass.

There's some redundancy here too. It'd also make sense on AmbientLightLayer.ConfiguredClass etc.

[JPMeehan]

For what it's worth I don't think configured sheet class is helpful because it's too easy for end users to change from expected.

[LukeAbby]

That's true. Do you think we should deprecate the ability to get that from the configuration? It is kind of a legacy thing.

I suppose it might be better to just do typeof YourConfiguredClass | typeof GenericSheetClass like we do for document.type.

[JPMeehan]

I'm eh on if it's useful at all to be honest.