JSON: refactor: combing bool ==> enum; introduction of noskin combing (CURA-694)
JSON: refactor: combing bool ==> enum; introduction of noskin combing (CURA-694)

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