Port System Settings sidebar to QQC2
Summary:
Also makes QML imports consistent.
Test Plan: Open the System Settings. Everything should still work.
Reviewers: Plasma, VDG, ngraham, mart, broulik
Reviewed By: Plasma, VDG, ngraham, broulik
Subscribers: mart, filipf, ngraham, broulik, VDG, plasma-devel, Plasma
Tags: Plasma
Maniphest Tasks: T10862
Differential Revision: https://phabricator.kde.org/D22896