v1.30.0 — Pick your difficulty, or ignore the tiers entirely

v1.30.0 — Pick your difficulty, or ignore the tiers entirely

Until now every game drew from the same fixed pool: the two most-recognisable
difficulty tiers, with no way to change it. That works badly for a library whose
tier data is sparse — and for some collections it meant the game would not start at all.

A difficulty setting on the setup screen, remembered across games and restarts:

Normal	the songs most people know — unchanged default behaviour
Harder	deeper cuts
Everything	anything in your library, ignoring the popularity tiers completely

Everything is the one to reach for if your collection is niche, or if scoring has
left most of it outside the usual pool. It selects across the whole playable library.

Existing installs are unaffected: no setting means Normal, which is exactly what the
game did before.

Difficulty tiering itself is unchanged in this release. Worth knowing if your library
shows few or no "easy" tracks: that tier is assigned purely from your own listening
history in your music server, so a fresh install with no plays or starred tracks will
never have any, whatever the size of the collection. Choosing a difficulty that is
actually populated is the fix.

As always, the app never touches your music files.