[AU4] Time of day as a scale in the timeline

### Problem to be solved

For long recordings, like several hours of bird recording, "nocmig", etc., there would be a very nice feature to see the timeline as time of day. You could then easily se _when_ something in the recording has happened.

This could also sort several (shorter) recordings on the right place (relative to each other) on the timeline, with correct gaps, with or without overlaps. Overlapping is also useful when comparing several sound sources, also usual for concert recordings. etc.

### Your idea

The starting timestamp should be resolved from the file name with a custom pattern, typically with YYYY, MM, DD, hh, mm, ss, etc. . Most/all recorders have a timestamp in the filename. It could also look up file metadata if present.

### Prior art

This is a feature of Raven Pro/Lite.

### Additional context

_No response_