Revert "Revert "Get rid of KDELibs4Support""
Summary:
This reverts commit 55603160e9b894270a34e7d01e0aef5bbbfe8025.
"Get rid of KDELibs4Support" was reverted because Can* methods
of PowerManagement class returned incorrect values due to async
DBus calls. Use blocking DBus calls now.
Reviewers: davidedmundson, broulik, Plasma
Reviewed By: davidedmundson, Plasma
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D11744