Store the file list sorting mode in GSettings
WIP Store the scanner window mode in GSettings

Seems to "lag" when selecting the mode in the scanner dialog combo box.
Store the file extension case mode in GSettings
Store the playlist content mode in GSettings
Store ID3v1 and ID3v2 iconv options in GSettings
Store rename filename encoding in GSettings
Store the process fields option in GSettings
Store disc padding preferences in GSettings
Store ID3v2.4/2.3 preference in GSettings
Store default browse path in GSettings WIP

Still TODO: checking for a valid path. Consolidating validity checks
into one place.
Store scan space conversion options in GSettings
Store case sensitive sorting mode in GSettings
Store CDDB search preferences in GSettings
Store process fields conversions in GSettings
Store character set preferences in GSettings
Store playlist mask preferences in GSettings
Remove local CDDB search function

It is very unlikely that people have a local copy of the CDDB, and the
settings code for this would be rather awkward.
Remove rename directory mask history

Use a single default mask instead.
Store default scanner masks in GSettings
Launch default audio player for directory

Use GAppInfo to discover the default player for the content type of the
first file in the list, and play the files in the directory using that
player.