Fix issues with lyrics & multiple voices

This fixes two separate issues with lyrics & multiple voices.  One is a critical bug that results in lyrics attached to voices > 1 in 1.3 scores being reassigned to notes in voice 1 or discarded if there is nothing in voice 1 at that tick.  The other is a layout issue where hyphens are drawn incorrectly for syllables attached to voices > 1; this one affects scores created from scratch as well.