SlipOperation
data class SlipOperation(val code: String?, val feedLines: Int?, val textSize: Int?, val text: String?, val textLeft: String?, val textRight: String?, val qrText: String?, val alignment: Int?)
{code: 'feed-paper', feedLines: 10}, {code: 'string-printing', textSize: 10, text: 'BBB'}, {code: 'sides-string-printing', textLeft: 'bbb', textRight: 'cccc', textSize: 10}, {code: 'qr-code', qrText: '834792874', textLeft: '1111'}