Wasm & npm package

[JolifantoBambla]

Use emscripten for now

[JolifantoBambla]

tested wasm build with 4.3m triangles - took 3091493 ms (~51.5 min) (vs 75ms on native)
guess it's not super useful (as expected) but could be still fun for some hobby projects

[JolifantoBambla]

no idea why it took so long the first time - it's ~15 min now for the 4.3 million tris

[JolifantoBambla]

It would be nice to have attributes for the version that uses assimp to load the model - maybe expose some assimp postprocessing flags.

[JolifantoBambla]

Npm package needs some keywords

[JolifantoBambla]

Link to js files in top level readme