Currently m_iteratedEntry is the forward launcher only. However, when we incorporate mid-system beams it will become a backwards launcher as well, and then we will need to differentiate.
It may be necessary to add some fuzzy logic around StaffGroup here, at least for category staff lists. Finale includes a staff if it is the top staff in a group, when the top staff of a group is included. We defer this to another day.
Member musx::util::SvgConvert::toSvg (const dom::others::ShapeDef &shape, double scaling, SvgUnit unit, GlyphMetricsFn glyphMetrics)
Render start/end arrowhead caps for line/path instructions.