[#63083948]

* 63083948-pdf-source-code: (22 commits)
  Issue pull request for branch 63083948-pdf-source-code
  Properly prepend the fontsize in PDF books
  Issue pull request for branch 63077604-ensuremath
  Add support for \ensuremath{...}
  Tidy up handling of newlines
  Issue pull request for branch 62999446-multiline-eq
  Support multiline embedded equations
  Speed up label detection using a global salt
  Issue pull request for branch centered-image-no-caption-62973860
  Override convert_standalone_image
  Add some failing tests
  Omit colon in captions with only a label
  Use \includegraphics for inline images
  Handle inline graphics correctly
  Issue pull request for branch chapter-toc-62963228
  Add chapter* to table of contents
  Read the PolyTeXnic styles directly from the gem
  Make anal changes
  Issue pull request for branch 62858372-links-percents
  Handle percents in link URLs properly
  ...
Bump version number
Merge branch 'stable'