bugfix: support roof config and support roof sendPolygons(.)
bugfix: support roof config and support roof sendPolygons(.)

totalretribution/CuraEngine,pratikshashroff/pcura,markwal/CuraEngine,Ultimaker/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine,pratikshashroff/pcura,markwal/CuraEngine,ROBO3D/CuraEngine,markwal/CuraEngine,alephobjects/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,pratikshashroff/pcura