More time travel levels, upgraded PicoES.

New Levels

Toroban - 3 lasers, 1 mirror

Toroban - How many times will the player have to die in this level?

PicoES

Upgraded PicoES to v0.5.0. This includes support for node v10, yarn, jest. Now has a separate branch for built documentation. Has 0 runtime dependencies for smaller bundle size.