[Notes] Port to QQC2 and use GridView KCM components for the color chooser
Summary:
Additional changes:
- Use standard import names
Thanks to @GB_2 for providing the skeleton of this patch
Test Plan:
Everything works and color value is saved and loaded properly
Reviewers: VDG, Plasma, GB_2, ndavis, mart
Reviewed By: VDG, Plasma, ndavis, mart
Subscribers: mart, ndavis, GB_2, plasma-devel
Tags: Plasma
Maniphest Tasks: T10586
Differential Revision: https://phabricator.kde.org/D21221