Get rid of KDELibs4Support

Summary: The power management code is adapted from the kscreenlocker project, and added to the "powerdevilcode" library. Also the missed canHybridSuspend property is added to this code.

Reviewers: volkov, afiestas, broulik, graesslin, davidedmundson, #plasma

Reviewed By: davidedmundson, #plasma

Subscribers: graesslin, davidedmundson, broulik, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D4939