feat(GraphicalNote): add osmd.rules.GNote(note) (#660) to get GraphicalNote from Note
feat(GraphicalNote): add osmd.rules.GNote(note) (#660) to get GraphicalNote from Note

also see PR #559

opensheetmusicdisplay/opensheetmusicdisplay,opensheetmusicdisplay/opensheetmusicdisplay,opensheetmusicdisplay/opensheetmusicdisplay