D29232: [WIP][RFC]Introduce the Header color set

[Marco Martin]

mart requested review of this revision.

REPOSITORY
  R265 KConfigWidgets

REVISION DETAIL
  https://phabricator.kde.org/D29232

To: mart, #vdg, #plasma, cblack
Cc: ndavis, cblack, kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns