3MF now handles loading of multiple nodes correctly
3MF now handles loading of multiple nodes correctly

Contributes to CURA-1263

Curahelper/Cura,ynotstartups/Wanhao,hmflash/Cura,hmflash/Cura,fieldOfView/Cura,fieldOfView/Cura,ynotstartups/Wanhao,Curahelper/Cura