[StG] Rigged Demo Prim

This cube has two faces, top-bottom, and sides, so it'll display two textures (it has two on it already, but you can change those). It is hard-rigged to the pelvis and hovers above the avatar's head.

I made it because I found out that if I put resize scripts in my demos, some people had worked out how to make the demo prims vanish!

Oops.

But hey, not only does this fix that, but it also speeds up the whole process of making demos. Which is no bad thing.

You can probably find other uses for it, but I'm putting it here as a resource for creators and builders who find demos hard. Go for it.