Add conversion from mensural to CMN · rism-digital/verovio@bbce956

ligature-001 produced a different time map

ligature-001 produced a different rendering

ligature-002 produced a different time map

ligature-002 produced a different rendering

ligature-003 produced a different time map

ligature-003 produced a different rendering

ligature-004 produced a different time map

ligature-004 produced a different rendering

ligature-005 produced a different time map

ligature-005 produced a different rendering

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