Enable sorting genres by song count #174
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Adds a menu to the genre list to enable toggling sorting genres between song count and name (the previous default), and saves the option to shared preferences.
Sorting by song count is useful for finding music from your favorite genres, especially if your music library has many. For this use case, and for the sake of simplicity, the sort is only in descending order.
I manually added some translations for the new menu options, but I'm not sure of their accuracy or if the translations are already managed in some other way.
I added a few unit tests, which require some added libraries, for the sake of my own practise if nothing else.