D23585: Add color and palette APIs for Grantlee

[Volker Krause]

vkrause added a task: T8837: QColor support for Grantlee.

REPOSITORY
  R77 PIM: Grantlee Theme

REVISION DETAIL
  https://phabricator.kde.org/D23585

To: vkrause, skelly, kde-pim, dvratil
Cc: dvratil, fbampaloukas, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss
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