Revert "Revert "Get rid of KDELibs4Support""

Authored by volkov on Mar 27 2018, 10:45 AM.

Description

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