Load sets from The Session API

[zmoon]

Currently you can load the sets archive (the_session.load_meta('sets')), where each row is a tune in a set (currently 218_867 rows). And from this you could discover a user's sets and load specific sets. But you can also load a set or discover a user's sets with the API, which should be faster, and always up-to-date, whereas the archive does lag a bit. The API approach also lets you use tags, a new-ish feature (the tune and set archives don't include tags currently).

I have some initial code for this in trad-setlist-helper but would prefer it live here.

• All of Jeremy's sets: https://thesession.org/members/1/sets?format=json (note paginatation is necessary)
• All of Jeremy's tags: https://thesession.org/members/1/tags (no JSON option)
• A certain set: https://thesession.org/members/1/sets/100112?format=json (note user and setting ID are both needed)
• Tunes with a tag: https://thesession.org/members/1/tags/AncientMariner/tunes?format=json
• Sets with a tag: https://thesession.org/members/1/tags/AncientMariner/tunesets?format=json

For posterity, sets was a new feature in 2016.