Tuner:
Improve frequency precision.
Fix note name not working in Latin.

Metronome:
Fix time signature not changed after selecting time/subdivision.
Fix metronome needle go reverse after changing tempo.
Remove re-entrant look in profit of semaphore.
Skip frame on very slow device.
Remove number picker dialog, and show directly keyboard for select the tempo.

Synthesizer:
Fix octave not change when selecting another and not playing.
Improve audio glitch.

Other:
Repair donation link.
Remove google.material dependency.
Set Min sdk to 21 (not working Under android 4.4).
Rename package from com.tuner.diatronome to org.kalinisa.diatronome