D29502: kwidgetsaddons: Add a named colors support in KColorCombo.

[Gustavo Carneiro]

araujoluis added a reviewer: VDG.

REPOSITORY
  R236 KWidgetsAddons

BRANCH
  named_color_support

REVISION DETAIL
  https://phabricator.kde.org/D29502

To: araujoluis, tcanabrava, patrickelectric, hindenburg, ngraham, #vdg
Cc: cblack, broulik, cfeck, kde-frameworks-devel, LeGast00n, michaelh, ngraham, 
bruns