Perceptually uniform ggplot colormaps

[asinghvi17]

Would be nice to maybe depend on PerceptualColourMaps.jl for this. The current colormaps are just formed by two colors, which I would like to move past in the long term.

[mkborregaard]

No reason to depend on that package. Every plot package should depend on Colorschemes (and Makie already does this), which also includs all the PerceptualColorMaps under the name "colorcet".

[asinghvi17]

Right, but unless I'm missing something, the colormaps here are not included in colorcet, so we'd have to generate them. They look fine now, this is more of a nice-to-have.

[mkborregaard]

Which colormaps are those?
PerceptualColorMaps is a crazy heavy dependency, or at least it used to depend on the entire Images ecosystem

[asinghvi17]

Ouch, yeah it depends on Images and PyPlot as well. Might be best to just generate the colors and write the array out in MakieThemes.

Basically all the colormaps of ggthemr aren't represented in ColorSchemes. Another idea is that we could PR them over there.

[mkborregaard]

Yes that would be my suggestion
Colorschemes tries to be the hub of all things color