WIP: xwayland: Compute and set screen size and position

Olivier Fourdan requested to merge ofourdan/xserver:xwayland-limitless into master

Unlike XRandR, the Wayland output layouts may have outputs placed at negative offsets.

Make sure to compute the size and also the actual location of the screen based on all outputs size and position.

Closes: #899

Edited by Olivier Fourdan

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