Suggested feature: Allow user to zoom in the timeline

[Raindrops]

Sometimes a track is very long (e.g. 8 hours).
The timeline panel shows the entire track at 100% zoom.
But at that zoom, we cannot see the individual peaks/roughs in the waveform.
Thus the entire advantage of Resonic over other players is washed out.

Let the user zoom in a specific part of the waveform, to position the cursor precisely.

[Tom]

Catching up on these mid-corona posts. Gotta forward this to:
https://resonic.at/faq#zoom