📣 borb release 2.1.0

This release is a feature release:

The LayoutElement framework has had a major upgrade
- Each LayoutElement now offers a get_layout_box method which tells you how much space a LayoutElement takes up
- Each LayoutElement now offers a paint method which renders the LayoutElement on a Page
- LayoutElement only adds its own content to the Page (previously it would change the order of page content to ensure backgrounds get drawn first)
As a result of these changes, layout is a bit faster in this release, compared to previous releases
All tests have been checked and changed to take into account the new behaviour
Tests that perform visual comparison ignore HexColor("00ff00"), which allows me to add the date of the test in the output, and still compare only the relevant pixels
MarkdownToPDF has been refactored to convert Markdown to HTML
HTMLToPDF still needs work to produce PDF documents

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