Yahkub

Pushed up first pass at overrides changes [Overview](https://github.com/godotengine/godot-proposals/issues/8266#issuecomment-2179563590) Example project: [8266-project-overrides.zip](https://github.com/user-attachments/files/16128699/8266-project-overrides.zip)

Updated the original post to hopefully better explain what I'm trying to achieve and other issues I think this resolves. I will continue to cleanup this pr and slim down...

I believe I fixed some of the saving issues and updated it to display exposed nodes in correct hierarchical order: base spinner scene:  Instantiated: 

> If an exposed node is a child of non-exposed node, it will not appear in the instancing scene.   

I just happened to be working on a similar project and experienced the same issue. One easy fix for now would be to tell your SubViewport to use its own...

Fixed by https://github.com/godotengine/godot/pull/95420

@ManasMakde This issue appears to be resolved in v4.3.rc.custom_build [3e0c10d39] can you confirm?