Scene should snapshot settings when created

Currently after changing a setting that requires a scene reload, the scene has the changed setting and is still rendering which potentially puts the scene in an invalid state

This would only be required for settings that require a scene reload.

Start by tracing where scenes are created and how settings that require a scene reload are applied while rendering continues. Done means the scene keeps the settings captured at creation time until a reload occurs, avoiding an invalid rendering state; verify the behavior with the relevant scene and settings tests if available.

Written by the indexing model from the issue text.