Add an icon for "save all" and only enable the action when it makes sense
Add an icon for "save all" and only enable the action when it makes sense

ad1217/Cura,senttech/Cura,fieldOfView/Cura,lo0ol/Ultimaker-Cura,ad1217/Cura,markwal/Cura,fieldOfView/Cura,totalretribution/Cura,Curahelper/Cura,bq/Ultimaker-Cura,bq/Ultimaker-Cura,ynotstartups/Wanhao,hmflash/Cura,fxtentacle/Cura,senttech/Cura,hmflash/Cura,ynotstartups/Wanhao,fxtentacle/Cura,Curahelper/Cura,lo0ol/Ultimaker-Cura,totalretribution/Cura,markwal/Cura