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

[mrkn]

• Charty::Color is going to be Color in red-color
• Charty::Colormap is going to be Color::Map in red-color (Support the features such as matplotlib's colormap red-colors#2)
• Charty::Palette is going to be Palette in red-palette (Import Charty::Palette red-palette#1)
• Use red-palette