export kwin theme to l&f
Summary:
export also kwin theme to look and feel themes
including the button order
tabbox and desktoip switcher are fixed to be taken from the
proper groups
Test Plan: created a customized lnf theme that is properly applied
Reviewers: Plasma
Subscribers: graesslin, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D3833