Different output so different version rather than an upgrade

... that want to use artists list in the same way to fix artist string

PICARD-1028: New "Smart Title Case" plugin

…message

Without this, the plugin doesn't work.

Picards logging module is already imported, there's no need to reinvent debug
levels etc. here

New simpler version of Abbreviate Artist Sort

This plugin provides standardized, credited and sorted artist
information for the album artist.  This is useful when your tagging
or renaming scripts require both the standardized artist name and
the credited artist name, or more detailed information about the
album artists.

Simplified outputs as requested during review.  Now provides information
for the complete album artist chain and the first (primary) album artist
only.

Use the _albumartists values when creating either the _aaeStd* or the
_aaeCred* variables depending on the value of the 'Use standardized
artist name' setting.

Use the _albumartists_sort values when creating the _aaeSort* variables.

AlbumArtist Extension v0.5

Add matches for sort tags, so these are modified when the corresponding metadata tags are cleaned of featured artists.

Slight modification of JeromyNix (NobahdiAtoll)'s changes, where credit is due (and given): https://github.com/NobahdiAtoll/MusicBrainzPicardPlugins/blob/master/featartistsintitlesfix.py

Update from original

To replace PR 109

Add Classical Extras

featartistsintitles.py: also remove feat. artists from sort tags

tested againgst moodbar from https://github.com/madmouser1/moodbar by sjohannes (https://github.com/sjohannes)