reteclock 0.58.0

Changed

• The timer's cues are played by one background service for the whole run, wherever you are and
  with the screen off, and an exact alarm wakes the phone for each one: no more count-in heard twice,
  and no cues lost to Doze, a battery saver or a closed app.
• Timer sounds and messages play on the alarm volume, from the phone's speaker even with a headset
  connected. On vibrate the timer buzzes, on silent it only shows, as before; at the finish a
  notification says it finished.

Added

• Timer settings → Battery saving (Android 6 and newer): whether battery optimisation may hold the
  app back, and a button to its settings.