Sound Juicer "It's Deeper Than The Darkest Sea" 2.21.3
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* Add a Disc Number field, and magically populate it (Matthew Martin)
* Add content/* media types (Matthias Clasen)
* Set a11y relationships on the cluebar (thanks Rich and Willie)
* Fix play/pause (Bill O'Shea)
* Handle the cdio element not being cdparanoia