Updated colorNames according to CSS Color Module Level 4

[ydaniv]

Mostly missing variants of gray/grey and added rebeccapurple.

[ydaniv]

Should note that currently colorsNames contain values in short hex format, which currently goes against current API description and docs, which state that it will translate color names to long hex.

I'd gladly add a commit that fixes all of these to long format if there's no objection.

[Yeti-or]

convertColors plugin choose what is shorter rgb() hex or name. So I think that docs are correct right now

[ydaniv]

@Yeti-or yes, took me awhile to figure out the purpose of all the different collections (:
but the problem is that if you set the config to:

shorthex: false
shortname: false

You'll expect all hexes to be in long format, but they won't.

And besides, there are some valid color names from the specs that are missing.

[ydaniv]

👍