escpos_arabic: ESC/POS receipts in pure Dart, with Arabic that prints correctly

<p>Printing a receipt on a thermal printer means sending it ESC/POS commands: a stream of bytes that says "bold on", "center this", "print this barcode", "cut the paper". For Latin text that is manageable. For Arabic it goes wrong quickly. The printer does not shape letters, so each one comes out in its isolated form, and it prints bytes in the order it receives them, so a right-to-left line comes

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