bugfix: partsView declared as struct instead of class
bugfix: partsView declared as struct instead of class

mspark93/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,alex1818/CuraEngine,uus169/CuraEngine,patrick3coffee/CuraTinyG,alex1818/CuraEngine,totalretribution/CuraEngine,pratikshashroff/pcura,alephobjects/CuraEngine,alephobjects/CuraEngine,uus169/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,fxtentacle/CuraEngine,markwal/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,pratikshashroff/pcura,fxtentacle/CuraEngine,pratikshashroff/pcura,markwal/CuraEngine,patrick3coffee/CuraTinyG,fxtentacle/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,patrick3coffee/CuraTinyG,mspark93/CuraEngine,mspark93/CuraEngine,markwal/CuraEngine,alex1818/CuraEngine,uus169/CuraEngine