This borrows heavily from the CSS4 fonts draft's font-palette, currently
found at https://drafts.csswg.org/css-fonts-4/#font-palette-control

The palette is mainly meant to trigger invalidations when colors used for
symbolic icons change, to potentially allow extending supported colors
in symbolic icons and to recolor all colors of a symbolic icon, not just
the main one.

The syntax for the property goes like this:
Name:        -gtk-icon-palette
Value:       default | name <color> [ , name <color> ]*
Initial:     default
Applies to:  all elements with icons
Inherited:   yes
Animatable:  yes, each color animated separately

The property defines a list of named colors to be used when looking up
icons. If a name is not defined, the value of the current "color"
property is used. Which names are relevant depends on the icons in use.
Currently symbolic icons make use of the names "success", "warning" and
"error".

"default" is the current behavior of the GTK when coloring symbol...