Make the colors themable instead of hard-coded (Seems broken too)

One reason that we don't have Per-App-Color, so we used our theme chooser colors. Someone will work it out to work as a customizable color later, as it's not gonna be me as i'm busy.
The gay way to make Pie themeable via Theme Chooser

- Bring a simple way to get colors off ColorPickerPreference?
Damn ugly looks of that dock launcher