
Move Subsonic state directory from `/var/subsonic` to `/var/lib/subsonic`, since the general convention is for each application to put its state directory there. Also, automatically set the home directory of the `subsonic` user to the value of `config.services.subsonic.home`, rather than setting it to a value hardcoded in the module. This keeps the home directory of the `subsonic` user and the state directory for the Subsonic application in sync.
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