fix: don't load inheriting json document (CURA-1574)
fix: don't load inheriting json document (CURA-1574)

The inherit property now refers to an id instead of a filename, so I cannot simply know which file I have to load from a given json file

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