Colo(u)r standardization

There's some talk about cyan, teal, and blue in forum #181297
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I was/am writing up a colour unification forum post for the site which aims to standardize all the color tags we use for all the different things..

But it may be a while until that's finished
In the meantime, anyone who's interested could have a look at the draft version

Of particular note are the following links:

• https://en.wikipedia.org/wiki/Basic_color_term#Basic_color_terms
• https://en.wikipedia.org/wiki/Spectral_color