enums library Null safety

Enums

PrinterMode
PrinterMode [...]
PrinterStatus
PrinterStatus [...]
SunmiBarcodeTextPos
SunmiBarcodeTextPos [...]
SunmiBarcodeType
SunmiBarcodeType [...]
SunmiFontSize
SunmiFontSize Enum to set font in the printer
SunmiPrintAlign
SunmiPrintAlign [...]
SunmiQrcodeLevel
SunmiQrcodeLevel