[effects/kscreen] Port to TimeLine
Test Plan:
Ran
xprop -root -f _KDE_KWIN_KSCREEN_SUPPORT 32c -set _KDE_KWIN_KSCREEN_SUPPORT 1 sleep 5 xprop -root -f _KDE_KWIN_KSCREEN_SUPPORT 32c -set _KDE_KWIN_KSCREEN_SUPPORT 3
Reviewers: KWin, davidedmundson
Reviewed By: KWin, davidedmundson
Subscribers: kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D13865