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Implement XDP window IDs on Wayland

Hennadii Chernyshchyk requested to merge github/fork/gasinvein/wayland-window-id into master

Created by: gasinvein

This completes #431

To attach a modal window to another app on Wayland, XDP requires the app to provide a reference to its window surface. This can be done via Wayland xdg-foreign protocol.

KWayland provides a nice C++/Qt wrappers around Wayland APIs. In the future we could switch to libportal-qt5, but it doesn't support the exact feature we're after. KWayalnd in Ubuntu 18.04 is too old, thus disable its use there.

Roughly tested on GNOME (doesn't seem to support zxdg_exporter_v2, so doesn't benefit from this PR) and Sway (supports zxdg_exporter_v2). I didn't manage to run a nested KWin Wayland compositor, but I hope it should work there, too.

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