520: Arc
521: Arc.SetStartEndLimit()

precise start and stop arc point
522: add BezierCurve
256: sag style arc, Not complete
527: svg style arc
528: svg arc, small radius correction
531: use myft.dll for font

myft.dll=>My  FreeType + HarfBuzz
533: pass render a single font
534: PathStorage
535: rename PathStorage->PathStore
537: refactor PathStore
539: fix RoundedRect
540: currentProcessingArc.UseStartEndLimit
541: CurveFlattener

rename from FlattenCurves
544: CommandEmpty
547: *** class ShapePath change Cmd definition

simplify vertex command test
549: rename some vars
559: DrawBezierCurve
561: move PathStore to Agg.Complement
562: move VertexData to Agg.Complement