Core/App: add more hz from 440 to 415 or 392 (and others) withh other adjustments for temperament like just/pure/valotti/others

I think for people who do accoustic music this would be helpful for the growing amount of people in early music or interested in different tunings to make the app/core more functional since this would compete with paid apps which offer the tuning for historically-inclined pitches. Paid apps like tunable do it, but they don't do wearables so this would take a bit more of this market here.

Merged into "Core: Customize Tuner frequency (from 440 hz to something else, e.g. 444hz)" #51