Add theme items for per-object settings
Add theme items for per-object settings

Contributes to #325

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