calculate incoming_perpundicular_normal in end stage of line order optimizer (CURA-1170)
calculate incoming_perpundicular_normal in end stage of line order optimizer (CURA-1170)

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