[DeviceNotifier] Port settings to QQC2 and Kirigami
Summary: Settings are ported to QtQuickControls 2 and now use a Kirigami Form Layout.
Test Plan:
Before:
After:
Reviewers: VDG, Plasma, ngraham, davidedmundson
Reviewed By: VDG, Plasma, ngraham, davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D19289