[Feature Request] Improve wasm demo

[TatriX]

I'd like to improve wasm demo a bit. In particular I'd like to move all inline styles to already existing css file, extract js code to a separate file, use es6+ in js code, replace setTimeout with requestAnimationFrame and thus remove double buffering example.

Also I'd like to make a realtime rendered demo.
If you think this sounds good, I can start working on that ;)

[38]

Sure that's awesome! I am really appreciate your contribute. Thank you in advance!