feat: SVG::writePolygons and better border handling
feat: SVG::writePolygons and better border handling

Ultimaker/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,Ultimaker/CuraEngine,totalretribution/CuraEngine,totalretribution/CuraEngine,totalretribution/CuraEngine