Handle times for structured episodes

These are from the episode start, so need to be added to that, not
used as-is.
Add formatting for playlist tracks
Fix incorrect regex for finding time
Show played times in 'UTC'

Ruby only believes in UTC and local time. All played times are UK
time, so they are stored and displayed as UTC - which is fine!
Add #sorted_playlist_tracks to items
Add sqlite-ruby to Gemfile
Wrap all hrefs in r()