D27017: [KColorUtils] Add hue(), chroma() and getHcyColor()

[Noah Davis]

ndavis added reviewers: Frameworks, dfaure.

REPOSITORY
  R273 KGuiAddons

REVISION DETAIL
  https://phabricator.kde.org/D27017

To: ndavis, #frameworks, dfaure
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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