Eliminate Need for Calculations on Server with WebAssembly

[hillmich]

I think removing the need for a server to perform calculations could make the visualizer and the hosting easier to maintain.

It would require compiling the C++ part to WebAssembly and interact with that instead of the server.
See https://webassembly.org/

This would also increase the number of users we can have simultaniously (at the expense of causing problems for users with slow hardware).