Adapt Xiph plugin for rollout. It's fairly terrible:
homepages gone, bitrate unavailable, case-sensitive category segregration.
On the upside: direct streaming server urls.

The 'cache' mode is likely broken soon, since the experimental JSON API is
gone.

For now using `.title()` on search. Adapted guess_format to
recognize AAC. Subtitle is used in lieu of On Air: text for playing=