Embed album art for mp3, flac and m4a
Allow for embedding of album art downloaded by the getalbumart fuction.
Currently this is available for flac (using metaflac), mp3 (using eyed3)
and m4a (using AtomicParsley). This can be invoked in 3 ways:
1. Use the commandline '-B' option (this will also call getalbumart)
2. Use the commandline '-a embedalbumart' option to add to list of actions
3. Use 'embedalbumart' in the 'ACTIONS' list in ~/.abcde.conf
Still needs more development but it is perfectly usable at the moment!