Added Brother 18mm label type

[snipe]

I don't know if the sizing is correct on this. Does anyone have an 18mm Brother label printer to test this PR?

[what-the-diff]

PR Summary

• Created New Label Template Class: TZe_18mm
  A new 'label template class' named TZe_18mm has been added to our system. This template contains pre-set dimensions and margins, ensuring it's formatted properly for each use. Additionally, this template can provide measures in the units we need, with the help of a 'unit converter'.

• Enhancements to TZe_18mm class via TZe_18mm_A Subclass
  We crafted a subclass or 'extension' to TZe_18mm named TZe_18mm_A. This extension enriches the original template with support for barcodes and additional text features, like 'AssetTag', '1DBarcode', '2DBarcode', 'Fields', 'Logo', and 'Title'. As a result, we can create more complex and feature-rich labels with this new extension.

• Effortless Preparation of PDFs
  Both the TZe_18mm and its extension TZe_18mm_A are paving the way for us to create PDF preparation tasks as straightforward as possible, while ensuring we have the flexibility to implement the preparation procedures as needed.

• Inclusion of Barcode and Text Writing Capabilities
  The write() function in TZe_18mm_A now has the ability to write barcodes and texts based on the given record data and the dimensions of the printable area. Thus, we can now dynamically generate labels complete with barcodes and text, all tailored according to our specific requirements.

[michaelortnerit]

Hello @snipe,

maybe i can test it. I have a P-touch P900W which supports 3.5mm to 36mm i will have a look if we have 18mm. Maybe next week i can give you feedback.

[snipe]

Thanks so much, @michaelortnerit!

[michaelortnerit]

No problem. I have found a 18mm label. Already cloning the branch and building a docker image for testing. :)

[snipe]

Any luck testing this?

[snipe]

@michaelortnerit - have you had a chance to test this by any chance?