Implement properly the Color class to handle multiple color formats

[isaacvr]

The current implementation of the Color class, have only support for rgb and rgba color spaces. It should be improved to handle CMYK, RYB and other color formats and its operations.

Why not just grab another library for color? Because we use interpolation even with the color, and that can be easily done if we use an own color handler. It does not need to be perfect and use all kind of colors, but at least the well known color spaces.