Playlist Item Genre Setting & Fixes

This release adds support for setting a playlist folder's items Genre tag to the name of the playlist. This allows an alternative way of browsing "playlists" in the Model S, much the same as TMC's Majorlance's AppleScript utility does.

Note, you can turn this option on or off, and regardless the playlist items are still available for playing via the folders created so that they can be played in order as well as shuffle, etc. Note that turning it on or off only affects future copies, not items already copied. You'll (as of now - but see below) have to go to the destination playlist(s) yourself and delete them if you want to redo your playlists completely using a new setting for the feature. The setting is saved to preferences, and my expectation is that people will set it according to their like/dislike of the Genre mapping feature, then mostly ignore it.

Also note that while this utility will remove items from playlists folders if you remove them from a selected playlist, and otherwise clean up the selected playlist folder to reflect playlist order changes, etc., it will not remove a playlist just because you deselect it from the playlist selection menu. I've tried to be very conservative about deleting files, both in the copy the whole library mode, as well as copying individual playlists. I can see the argument for doing it for playlists though. Would welcome feedback on this, as well as any other functionality.

Also fixed were a a couple different categories of bugs, mostly having to do with unicode accents and such in filenames leading to copies and playlist cleanups not working correctly in some cases.