📣 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