Added busy & error state to ConnectionState
Added busy & error state to ConnectionState

CURA-1339

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