Mark XmlMaterialProfile as type "material" so the import/export code can find it
Mark XmlMaterialProfile as type "material" so the import/export code can find it

Contributes to CURA-341

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