Add CNS colour system

[Magnogen]

"Red", "green", "blue". Super easy.

Hues, saturations, and lightnesses can be expressed in English - making colour picking work well.

Maybe also add an accuracy parameter? That way you can get more of a generative colour palette. Could be useful. I like generative stuff.

Might need to split up the accuracies into hue, sat, and lit too, but idk. Have a think.