Added activeStackChanged to BuildVolume, it is semantically more correct. Contributes to CURA-2232
Added activeStackChanged to BuildVolume, it is semantically more correct. Contributes to CURA-2232

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