Fixed.
I removed the fog settings because fog is a per-camera settings and the other stuff is all per-world.
I am not sure how fog and post-effects should be handled yet. Intuitively it seems like they would be set for the world, but I need to determine the rules that are in place for cameras that are created in code and in the scene, and whether cameras should have their own individual settings for these, and how that interacts with the per-map setting.