[audio] Handle device disconnected error

[basharovV]

When a device is disconnected, the following error causes the audio thread to panic and the app needs to be restarted:

ERROR Musicat::output::cpal:audio output error: The requested device is no longer available. For example, it has been unplugged.

To handle this, the error needs to be handled in the audio callback in output.rs and an event emitted to the AudioPlayer (handled in decode_loop) to re-init the audio device with the current default device.