Mapping Tonal Harmony Pro update

This is a complex app and it's just got more complex, but I think in a good way. Here's what's new:

• MIDI EXPORT - export progressions as MIDI files in any key
• PRINT WORKSHEETS - print progressions as worksheets with functional analysis (or chord progression in any key)
• SHOW/HIDE UNUSED CHORDS - the map now has the option to filter out all functions not used in the current progression
• AUDIO HARMONIC MARKERS - audio tracks now show functional markers on a timeline to analyze and understand the harmonic rhythm in the current piece.
• AUDIO ONION SKIN MARKERS - you can now select a section of the audio track you want to view, listen and analyze.
• HARMONIC PATHS ON AUDIO TRACKS - harmonic paths are now available on audio tracks (also reflecting the audio onion markers)
• NEW AUDIO TRACKS AVAILABLE.
• minor bug fixed (user songs were not saving to storage)