draft: add generic layout detection to keyboard-state #4430
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Fixes #4101, #4184, and potentially some others. This also has the potential to replace the language modules for sway, hyprland, and niri.
As a first step, I re-implemented the keyboard-state module to use the keyboard information provided by wayland rather than libinput. In a second step, I added layout detection based on that same information.
This works for me (on labwc), but at the same time it sounds too good to be true. So there might well be a huge downside to this approach that I am not aware of.
Currently this is a rough draft and could use some cleanup. But I wanted to get feedback on the general approach before spending too much time.