Allow color initialization from string with color space prefix

Moved from [webgl-operate](https://github.com/cginternals/webgl-operate/issues/25)

Implement parser for color initialization/creation, e.g.,
* `Color.parse('lab(0.1, 0.1, 0.1)');`
* `Color.parse('rgb(0.1, 0.1, 0.1)');`
* `Color.parse('hsl(0.1, 0.1, 0.1)');`
* `Color.parse('cmyk(0.1, 0.1, 0.1, 0.1)');`
* `Color.parse('rgba(0.1, 0.1, 0.1, 0.1)');`
* etc

This could be also useful (among other things), e.g., data attributes of canvases in haeley-canvas `` ... currently only parsing of a 4-tuple is supported and interpreted as rgba (in `Canvas.constructor`).