Javascript Ray Marcher v0.12

I made some large speedups, and moved more configuration variables into the proper config variable. Now we can see where the camera is, what it is looking at, and other useful scene configuration.

I also shrunk the calculation display, later on I'll make it pop out on mouseover.

There are several experiments with the scene, adding more objects and re-introducing a ground plane to speed up rendering.

We also add a special triangle object to hopefully enable rendering models from other formats.