This Thread uses the audio.tagger.tag_file() function to find the tags
for a specific file without hanging the UI. There may be cases where we
have an Artist MBID but not the matching Artist name. When this happens,
I do my best to first check the database and then query the musicbrainz
server.
I take some care to only connect to the database once, and to close the
connection when the thread exits.
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>