Feature: Themes/Material switching

[fragmental]

I'm not sure how we could implement this, and I suspect we may not have time before release, but it would be nice to have themes for tables that would essentially just change all of the materials.

One way we could do this maybe is to have 2 prefabs of the geometry in the scene, with two sets of materials, and just enable and disable them.

For example, the speedster table currently has some materials made by @kednar and @KGuNN45 is working on some new tron inspired materials.

[Cheeseness]

This would be super nice to have, but definitely feels out-of-scope for Amnesia Fortnight. Let's circle back and pick this up afterward.