Revamp the radio API

[EventideGlow]

Pony.fm currently has an undocumented API for use by radios but it could use some improvement. A "v2" of the radio API should be written that features the following:

• OAuth 2.0 authentication with Poniverse.net
• leaves out tracks that aren't licensed for redistribution
• provides an easy way to grab metadata in a batch for all redistributable tracks
  • also provides a way to grab metadata for new tracks or tracks that have been updated since a given point in time (to minimize re-processing on the radio station's end)
• allows retrieving of a single track's metadata by ID
• guarantees that every track has a title, artist, and cover art
• allows radio stations to notify Pony.fm whenever they play a track (so we can collect and display this data)
• is publicly documented

[daniel-j]

+1

[westjgames]

Also, important, add a "reverse ID", which allows a fuzzy search to get an ID and details for a track.