enhance(printer): Implement flush for PrinterWriter
#386
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The `PrinterWriter` now implements the `flush` method by sending a `Flush` command to the printer and waiting for it to be processed. This ensures that all messages written to the printer are fully handled before the call returns. Additionally, added a `Printable` implementation for `&String` to allow more flexible usage when printing string references. Signed-off-by: Jean Mertz <git@jeanmertz.com>
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The
PrinterWriternow implements theflushmethod by sending aFlushcommand to the printer and waiting for it to be processed. This ensures that all messages written to the printer are fully handled before the call returns.Additionally, added a
Printableimplementation for&Stringto allow more flexible usage when printing string references.