Port Clipboard and Notifications applets to Kirigami.PlaceholderMessage
Summary:
The Clipboard and Notifications applets live in plasma-workspace; port them to use
Kirigami.PlaceholderMessage
Test Plan:
Clipboard:
Notifications:
Reviewers: VDG, Plasma, broulik, niccolove, cblack
Reviewed By: VDG, Plasma, niccolove, cblack
Subscribers: plasma-devel
Tags: Plasma
Maniphest Tasks: T13021
Differential Revision: https://phabricator.kde.org/D29109