Feature: Sleep timer

[cweiske]

It would be nice if YAACC had a "sleep timer" feature that stops music playback after a given amount of time.

There should be an option in the settings to configure the length of the sleep timer.
The main UI should have a "activate sleep timer" menu item in the top right "..." menu.

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YAACC 4.1.0 does not have it.
The "Transistor" radio app has a sleep timer feature: https://codeberg.org/y20k/transistor