Adds the bindswitches option to the sway module.
Bindswitches allows you to run a sway command when a state changes (when a certain event occurs).
See https://github.com/swaywm/sway/wiki#clamshell-mode and sway(5) for more information
It was already possible to configure this through sway.extraConfig but I find this approach dirty as described by the Nix RFC 42, and there is currently no settings as it describes.
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