Cut out Charty::Color and Charty::Palette as red-color and red-palette libraries, respectively

[mrkn]

• [x] Charty::Color is going to be Color in red-color
• [ ] Charty::Colormap is going to be Color::Map in red-color (https://github.com/red-data-tools/red-colors/issues/2)
• [x] Charty::Palette is going to be Palette in red-palette (https://github.com/red-data-tools/red-palette/issues/1)
• [x] Use red-palette