NotateMe Now

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Replaced Dropbox Sync with improved Import and Export functionality.
- Import JPEGS (for PhotoScore) and NotateMe and MusicXML files from Dropbox, Google Drive and other apps.
- Export to Dropbox, Google Drive and other apps.
Voice allocation improvements, particularly for 3 and 4 voices.
Other parsing improvements.
Hold down play button in editing mode to toggle between playing back all instruments and just the current instrument.
UI tweaks.
Bug fixes.