Port away from deprecated KDELibs4Support
Summary: kmenuedit seems to work, adding new submenus and items
Reviewers: mlaurent, vkrause
Reviewed By: mlaurent, vkrause
Subscribers: vkrause, plasma-devel, kde-frameworks-devel
Tags: Plasma
Maniphest Tasks: T11566
Differential Revision: https://phabricator.kde.org/D24603