Combine display OSD icon files and move to plasma icon theme

Summary:
Move the icons from D10937 to plasma-frameworks and combine all the sizes

BUG: 395714

Test Plan: "osd-shutd-screen.svg" does not display correctly for me. I can't find any difference between it and the rest of the icons. Help appreciated.

Reviewers: ngraham, VDG, broulik

Reviewed By: ngraham, VDG, broulik

Subscribers: broulik, kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D14971