Deal with colour related struct/functions, such as ColourSpaces etc.
This module mostly exist to have a bridge with the ggplotd code and the ggplotd.color code. That is because the ggplotd.color code might become part of phobos one day and I don't want to depend directly on ggplotd's implementation, so that it stays easy to switch to an alternative (phobos) based implementation.
Helper functions for working with geometrical shapes
Some helper functions for ranges