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Remove the BRAINZ3 option.

Description

Remove the BRAINZ3 option.
The webservice provided by audio/libmusicbrainz3 will cease operation on
2018-08-01. Libmusicbrainz3 has been marked deprecated for 6 months and is
scheduled for removal.
https://blog.musicbrainz.org/2018/02/01/web-service-ver-1-0-ws-1-will-be-removed-in-6-months/

While here, convert the rest of the options logic to options helpers.

Details

Provenance
jhaleAuthored on
Parents
rP476024: - Update to 18.3
Branches
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