Pymdown-extensions

- **NEW**: Formally declare support for Python 3.11.
- **FIX**: BetterEm: Fix case where `**` nested between `*` would be handled in an unexpected way.

- **NEW**: Tabbed: Add new syntax to allow forcing a specific tab to be selected by default.
- **NEW**: Snippets: Add a new option to pass arbitrary HTTP headers.
- **NEW**: Snippets: Allow specifying sections in a snippet and including just the specified section.

- **NEW**: Highlight: Allow greater granularity of specifying where language guessing takes place via `guess_lang`
option (e.g. `block` vs `inline`).
- **NEW**: Tabbed: Add options for generating tab IDs from tab titles.
- **NEW**: Snippets: Add support for specifying specific lines for Snippets.
- **NEW**: Snippets: Commenting out files in block format no longer requires a space directly after `;`.
- **NEW**: Snippets: A new sane way to escape snippets is now available.

- **NEW**: InlineHilite: Custom inline code block formatters can now be forced to raise an exception by raising a
`InlineHiliteException`.
- **NEW**: Snippets: Add new options to handle importing snippets from URL.
- **NEW**: Snippets: Snippets will only swallow missing file errors (unless `check_paths` is enabled), all other errors
will be propagated up.
- **NEW**: Snippets: When a file or URL is missing, raise `SnippetMissingError` instead of `IOError`.
- **FIX**: Snippets: Small issues related to recursive inclusion of snippets.

- **NEW**: Highlight: Changes in order to support Pygments 2.12+. If using Pygments and a version less than 2.12 is
installed, Highlight will raise an exception.

- **NEW**: B64: Allow SVG to be encoded and inlined.
- **NEW**: PathConverter: Add option to use `file://` prefix on absolute paths.
- **FIX**: Highlight: Ensure that `extend_pygments_lang` is not case sensitive regarding language names.