Please add save option to cue playlists (patch included)
After working on the extended m3u playlist plugin for issue#875, I decided to try my hand at the cuesheet plugin as well. The included patch adds ability to save playlists to proper .cue format. Only "file" entries are added (warns for non-file urls) and cue-sheet entries are converted to their "AudioFile" value to avoid "recursive" cuesheets embedded in cue files. It seems to work fine to specify "MP3" on the "FILE" line for all entries as it is ignored, except to check for the flag's existance and other values like "OGG", "WAV", etc. cause libcue to throw sintax errors. Please review.