* Add skeleton for new label sheet plugin
* Add custom printing options serializer
* Render individual label outputs to HTML
* Extract page size and column size
* Check label dimensions before printing
* Split labels into multiple pages / sheets
* Render out multiple labels onto a single sheet
* Cleanup base label template
- Allow @page style to *not* be generated
- Pass through as optional context variable
- Check that it still works for single label printing (default behaviour unchanged)
- Prevents multiple @page styles from being generated on label sheet output
* Fix stylesheets for part labels
* Cleanup stock location labels
* Cleanup more label templates
* Check if label can actually fit on page
* Generate output to PDF and return correct response
* Update panel.md
* Fix unit tests
* More unit test fixes
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