Implement dat-gui

[dmasad]

Add dat-gui to the ASCII server.

[dmasad]

This is basically resolved in the appropriate branch. However, it wasn't as elegant as I hoped, because:

I tried wrapping the entire visualization everything in a 'class' in a separate file, which was very elegant. However, right now, model animation is handled by setInterval, which is controlled at the Window level, and hence doesn't have access to the object's this property. This is a known issue, which is actually called The 'this' issue. I tried implementing the hack that the Mozilla documentation suggests, but it wasn't working for me for some reason.
¯_(ツ)_/¯

The current template code is messier, but since I don't anticipate an urgent need to run multiple models in a single window, we can probably live with the control functions all being global.

[dmasad]

Yup done.