Default theme as a vector of 9 pixels

[dumblob]

To ease adoption and make theming much easier, I'd prefer having "sane defaults" which if easily changed would lead to pleasant acceptable look (imagine Nuklear or ImGui defaults) with 0 effort?

I can imagine a vector of 9 pixels as the "default color palette" which would then be used for backgrounds, foregrounds, borders, hovers, etc.

This'd allow making a new "theme" as YAML one-liner refinable in the future as we go.

[Grokmoo]

I have to say this is a great idea and not something I thought of!