4.3.0

CHANGES:

• Dunify
  This also removes all the deprecated libraries (tyxml.syntax, tyxml.parser)
  and removes the ocamlfind library tyxml.ppx in favor of tyxml-ppx.
  (#197 by Drup, Rudi Grinberg and Anton Bachin)
• Add simplistic indentation for the Format-based printer (#187 by Drup)
• Allow the ppx to be used for more exotic tyxml instances, such
  as reactive elements (#200 by Drup)
• Add Html.of_seq and Svg.of_seq, which allow to easily import
  HTML parsed with markup in TyXML (#221 by Drup)

Elements and attributes

• Add Html.txt and Svg.txt as an alias for pcdata (#222 by Drup)
• Add noopener link types (#198 by Jérôme Vouillon)
• Slightly relax dt content type (#193 by Anton Bachin)
• Add touch events (#211 by Malthe Borch)
• Fix handling of figcaption in the PPX (#219 by Drup)