Create a JS port of Primitive to remove the Golang dependency

[technopagan]

Currently, SQIP relies on Primitive (https://github.com/fogleman/primitive), which is written in Go, being installed. We could remove this unelegant dependency by porting Primitive to JS, maybe by basing our porting work on https://github.com/ondras/primitive.js.

[robinpokorny]

@ondras, how difficult you think this would be?

[ondras]

Well, PrimitiveJS stands and falls with the 2D <canvas> DOM API. If the port is to be server-side, some corresponding lib/api has to be used.

As far as client side is concerned, PrimitiveJS is already a pretty close port of Primitive, using most of the algorithms from the initial Go implementation.

[Munter]

Canvas exists for node, but has some other drawbacks of required installations: https://www.npmjs.com/package/canvas#installation

I used it in histrogram, which also works on node: https://github.com/Munter/node-histogram/blob/master/lib/index.js#L109-L122

[axe312ger]

I made #25 to work around this for now.

But ++ on a node version :)

[axe312ger]

This is out of scope of this project 🙃