Provide a CLI to the WebGL visualizer

[earthdok]

We want to be able to do something like this:

$ solve.py model.mdl > trace.nbt $ draw.py model.mdl trace.nbt --steps-per-frame=1

and have draw.py open the webgl visualizer in the browser and start drawing the solution immediately (no need for the 'execute trace' button).

Alternatively it could be something like:

$ draw.py model.mdl trace.nbt --steps-per-frame=1 > output.html && open output.html

[Vlad-Shcherbina]

You might be interested in visualize_model, visualize_trace (in the dashboard).

[earthdok]

lgtm