Proposal for moving KColorScheme from KConfigWidgets to KGuiAddons

[Andreas Cord-Landwehr]

Hi, I want to propose to move the KColorScheme class from the KConfigWidgets 
famework to the KGuiAddons framework.

Reasons:
* that would reduce dependencies of KIconThemes and make it
  - a Tier 2 framework (currently Tier 3) and
  - make it easier to use KIconThemes on Android 
* KGuiAddons seems to be the much more logical place for this class in my 
opinion

My Questions:
a) Are there other opinions about this move?
b) What about KColorSchemeManager? I would propose to keep it at 
KConfigWidgets, though.
c) What is the best way to do this class move (also regarding KF5 policies)?

Cheers,
Andreas