Preview excerpts

[fluffy-critter]

What is the problem you are trying to solve?

Web previewer always gives the full song, which is also easy to download without payment

What solution would you like?

Add the ability to select an excerpt of the song to play, e.g. 30 seconds starting at 1:54

What alternatives have you considered?

Reducing the preview player quality just makes the song sound bad

What usage mode does this apply to?

All

Additional context

Adding support to the data schema would be pretty easy, with just like preview_start_time and preview_duration. Adding it to the GUI would ideally include #60.

There should probably be a brief fade-in/out as well.