## Description
For non English tracks (Swedish in my case) feat. words might be
something that ftintitle doesn't pick up.
Eg. for the song `Promoe med Afasi - Inflation`
[https://musicbrainz.org/recording/8e236347-61d6-4e11-9980-52f4cc6b905f](https://musicbrainz.org/recording/8e236347-61d6-4e11-9980-52f4cc6b905f)
the word `med` is `feat.` in Swedish.
With this PR you can add what ever word you wish to match as feat. so it
should cover any kind of language.
The config.yaml could look like this:
ftintitle:
custom_feat_words: ["med"]
## To Do
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Change the parameter name to omit_single_disc (vs previously zero_disc_if_single_disc)
Add return of 'fields_set' so that, if triggered by the command line `beets zero`, it will still effect the item.write.
Added tests.
This PR moves the `vfs.py` module, which is only used by plugins, to
avoid polluting the main beets namespace. Also exposes the `vfs` and
`art` module from beets with a deprecation warning.
