JSON: support hammock density and pattern
JSON: support hammock density and pattern

Curahelper/Cura,totalretribution/Cura,senttech/Cura,senttech/Cura,markwal/Cura,fxtentacle/Cura,fieldOfView/Cura,hmflash/Cura,Curahelper/Cura,fxtentacle/Cura,ad1217/Cura,fieldOfView/Cura,hmflash/Cura,bq/Ultimaker-Cura,ynotstartups/Wanhao,totalretribution/Cura,markwal/Cura,bq/Ultimaker-Cura,ynotstartups/Wanhao,ad1217/Cura