feature request: leave 256color - rgb hex somewhere for terminal configuration

[vdrandom]

Put somewhere a list of 256color approximations and respective rgb hex values when generating a scheme. I barely ever see decimal rgb values used anywhere. Maybe it's worth replacing rgb() with hex values in the comment, or just add another field there?

How this can be useful: to make generating something like this easier (can't use that one with vim-gruvbox8, for instance, since approximations are different).