Provide more info about color fonts

[o-t-w]

• In the CSS fonts Level 4 spec, base-palette can reference a named color-palette embedded inside the font. It would be very useful if Wakamai Fondue could show that information.
• override-colors can reference different layers of the font either using a numerical index, or named indexes. It would be useful if Wakamai Fondue could display the names of these layers

@font-palette-values Festival {
    font-family: Banner Flag;
    base-palette: 'Dark';
    override-colors:
        'Outline' rgb(123, 64, 27),
        'Base Glyph' currentColor,
        'Glints' var(--highlight);
}