Group by year/month view for tracklist

[oskarrough]

What

On v1 we always showed the tracklist grouped by date month. This gave it a nice kindof musical logbook feel. Would be great to add it back.

If we add it not as a default, but as an option, it raises new questions:

• should the user be able to store their prefered view? Per channel?
• should the owner be able to control how their tracks are presented?

How

We could write an SQL query that groups the tracks by month., but it feels easier for us to handle it in JavaScript land.

Add a new groupedTracks property on the tracklist component? Bonus feature if we abstract it so that you can set the property to group by.