Taken from https://github.com/Python-Markdown/markdown/tree/master/markdown, commit 383de86c64101b8d14768d9a247c9efc97d703bd.

Rationale: more markdown extensions will be added to this module later.

Preprocessor converts FORD syntax to markdown admonition syntax.

Mistake prevented locating the sibling element unless the admonition type was "note".

…rt marker.

E.g:
some text @Endnote some more text

E.g:
Some text @note Some more text.

* master: (327 commits)
  Apply PR suggestions
  [skip ci] Apply black changes
  Relax version on pygments
  recognize associations and calls made within associations
  refactor call chain correlation
  Docs: Fix syntax highlighting in example
  Docs: Fix some formatting and reword section on Markdown
  Docs: Fix link
  Docs: Fix typo
  Docs: More consistent spelling of "metadata"
  Docs: Clarify that metadata in docstrings is always parsed
  fix issues with PR
  generic module procedures inherit attributs from their interface
  find used modules for interfaces
  add args from parent procedures and private vars from ancestor mods to all_vars
  fix issues with errors with module procedures when setting display: private and with chain calls in module procedures
  Ignore mypy errors from setuptools_scm
  Fix undefined variable error
  Add ruff config
  Add helper class for creating markdown reader
  ...

Also add tests

Now should correctly handle nested blocks inside admonitions

either as immediately closing existing note, or text after @Endnote

Allows deleting a bunch of code, as well as being able to use CSS and
title features from base class