Page mode

[gtbX]

Description

Implement support for page mode, via the XML element. XML attributes can adjust the page size and text orientation on the page.

Also added tests for new code via the jest framework.

Related Issues

Issue: #27

How Has This Been Tested

Unit tests were written for the new code, as well as manual testing with an Epson TM-L90 printer.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.

Screenshots (if appropriate)

This XML template produced the attached printout

<?xml version="1.0" encoding="UTF-8"?>
<document>
  <page size="500:100" orientation="east">
    <text-line>foobar</text-line>
  </page>
  <paper-cut />
</document>