taskmanager : Implement window group dragging

Review Request #130030 - Created March 19, 2017 and updated

Information
Yoann Laissus
plasma-workspace
2b45364...
Reviewers
plasma

It can be dropped to other virtual desktops, for instance.

Tested with drops on other virtual desktops.
Only tested on X11. I'm not sure it can work on Wayland as the drag handling seems to be very X11 specific.

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