Add function for Xprinter brand printer

[Xelio]

• Add printer model "xprinter"
• Add util function to print CODE128 barcode on Xprinter
• Add util function to optimize CODE128 barcode length

[changeset-bot]

⚠️ No Changeset found

Latest commit: ce67387

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[Xelio]

Hi @dohooo, would you help to check and accept this PR?

[dohooo]

Thanks for your contribution!

[dohooo]

@Xelio published.