WebAssembly image dithering example

[Radu]

On Thursday, 2 August 2018 at 22:04:50 UTC, Allen Garvey wrote:
> Hi all. Using the WebAssembly tutorial from a few week ago, I 
> created a small example to dither an image. You can see the 
> source at https://github.com/allen-garvey/wasm-dither-example 
> and the demo at 
> https://allen-garvey.github.io/wasm-dither-example/. I had 
> heard about WebAssembly before this, but this was my first 
> experience actually using it, so it was an interesting project 
> for me, and overall a positive experience.
>
> [...]

Cool stuff!

You might wanna change some of the code to be more idiomatic, for 
example `DitherRCoefficient` can be turned into and enum manifest 
constant.

As side note, compiler explorer added support for webassembly 
assembly :) check this out https://godbolt.org/g/PskqaL