D22844: [WIP/RFC] [kcm-colors] Export colorscheme to GTK color definitions

[Carson Black]

cblack created this revision.
cblack added a reviewer: Plasma.
Herald added a project: Plasma.
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REVISION SUMMARY
  This exports the active colorscheme to ~/.config/gtk-3.0/colors.css and sets up ~/.config/gtk-3.0/gtk.css to read from it.
  This will do nothing visibly without changes to Breeze GTK [Todo: send diff for Breeze GTK and link here]
  This is not complete and only exports about 20ish out of 80ish colors as of this time.

TEST PLAN
  See that ~/.config/gtk-3.0/colors.css is created, colorscheme is dumped correctly, and that gtk.css links to it.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  kcm-colors-gtk (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D22844

AFFECTED FILES
  kcms/colors/colors.cpp

To: cblack, #plasma
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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