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Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>

- Strip redundant quotes to improve support for [Python Markdown](https://python-markdown.github.io/extensions/admonition/)
- Follow Python-Markdown's syntax to parse the title in double quotes and use all other tokens as classes

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Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>

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Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>

Usually footnote references are only matched when a footnote definition of the same label has already been found. If `always_match_refs=True`, any `[^...]` syntax will be treated as a footnote.

The previous logic was problematic for amsmath blocks nested in other blocs (such as blockquotes)

The new parsing code now principally follows the logic in `markdown_it/rules_block/fence.py`
(see also https://spec.commonmark.org/0.30/#fenced-code-blocks),
except that:

1. it allows for a closing tag on the same line as the opening tag, and
2. it does not allow for an opening tag without closing tag (i.e. no auto-closing)

The `allowed` option accepts a list of allowed attribute names.
If not ``None``, any attributes not in this list will be removed
and placed in the token's meta under the key `"insecure_attrs"`.

Co-authored-by: maximkurbatov <maximkurbatov@yandex-team.ru>
Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>