D28134: Add ColorUtils

[Carson Black]

cblack created this revision.
cblack added reviewers: Plasma, mart.
Herald added a project: Kirigami.
Herald added a subscriber: plasma-devel.
cblack requested review of this revision.

REVISION SUMMARY
  ColorUtils is a class that offers utilities for working with colour, offering the following items as a start:
  
  - `QColor averageColorForItem(QQuickItem*, int)` - Obtains the average colour of an item, ignoring transparent pixels
  - `Brightness brightnessForItem(QQuickItem*)` - Obtains the brightness of an item

REPOSITORY
  R169 Kirigami

BRANCH
  cblack/colour-utils

REVISION DETAIL
  https://phabricator.kde.org/D28134

AFFECTED FILES
  src/CMakeLists.txt
  src/colorutils.cpp
  src/colorutils.h
  src/kirigamiplugin.cpp

To: cblack, #plasma, mart
Cc: plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, ngraham, apol, ahiemstra, davidedmundson, mart
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