Refactoring of USBPrinting plugin
Refactoring of USBPrinting plugin

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