Make KWin action menu consistent with task manager, use action verbs for configure items and add more icons

Summary:

Test Plan: Open the context menu for a window (Alt+F3).

Reviewers: KWin, VDG, ndavis, davidedmundson

Reviewed By: KWin, VDG, ndavis, davidedmundson

Subscribers: davidedmundson, ndavis, VDG, kwin, KWin

Tags: KWin

Differential Revision: https://phabricator.kde.org/D23779