implemented readMetaFromFile()
getNext() now returns first item in Normal state
added libsndfiles file extensions
added TODO entry for Cart support
display tracks genre and length in playlists
added context menu for playlist manager to delete items or reset their state
changed playlist state colors a bit
made auto(un)mute function configurable from settings
send mute button changes to controller
reset/restart track when play it signalled again in play state
prevent that MIDI buttons fire event twice
also reset buffers when resetting track (sounds better)
trigger state enable/disable buttuns every time