Wayland support

[kolayne]

xdotool won't work on machines running Wayland, including some of the latest Ubuntu versions (22.04/22.10?). Rimokon should support both.

Besides, it'd be nice to make Rimokon look similar for the different display servers. It's probably impossible to make the commands look identical for the two cases, still, I want them to have a similar form. At the current moment of 1(?) active user, I don't mind making a backward incompatible change, as long as it improves the experience of the end-user (which is me 😊).