Adapt for Wayland (eOS 8)

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Please keep in mind I haven't tested it on Wayland yet even on VM!
The list is based solely on my assumptions of what will break:

• It seems both xfdesktop and nemo-desktop are ported on Wayland already, but additional testing is needed.
• Show Desktop schemes will harder, and also will require adding per-script session detection and support for both, instead of making 2 separate versions for each session type (otherwise then it will break after each session change, which is a probalem because eOS 8 will support both X11 and Wayland)
  • Since xdotool is X11-only, find an alternative that works with Wayland
  • Same goes about xprop, but it should be easier