[workspace KCM] Port to QQC2
Summary:
Port the Workspace KCM to QQC2.
BUG: 385547
FIXED-IN: 5.15.0
Test Plan:
- All functionality still works
- Keyboard navigation via the Tab key still works as expected
- Looks good at with a fractional scale factor now; here shown at 1.5x:
Reviewers: Plasma, davidedmundson, apol
Reviewed By: apol
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D16483