This allows better interoperation with CSS style sheets, as the align
object on the TH is skipped if the css uses 'text-align: inherit' and
the previous 'text-align' is used instead (or the default: left).

Added an override to restore the original `align` behavior
Moved existing tests to the new test infrastructure
Added new tests to test the configuration parameter
Updated documentation to document the configuration parameter.

* footnotes: Allow to use backlink title without footnote number
- The placeholder '{}' is optional. So a user can choose to include or
not the footnote number in the backlink text.
- The modification is backward compatible with configurations using
the old '%d' placeholder.

* footnotes: Allow to use custom superscript text

- The addition of a new SUPERSCRIPT_TEXT option allows to specify
a placeholder receiving the footnote number for the superscript text.

Closes #1224

This adds configuration support for using a custom Pygments formatter,
either by giving the string name, or a custom formatter class (or
callable).

* Add an extra option `lang_str` to pass the language of the code block
to the specified Pygments formatter.
* Include an example custom Pygments formatter in the documentation
that includes the language of the code in the output using the new option.

Resolves #1255.

Python dropped support on 2021-12-23. Our policy (#760) is to drop
support on the next point release after Python does.

* Remove py36 tests
* Test multiple recent versions of pypy
* Remove pep562 backport

Fixes #1261.

Fixes #1263.

This completely removes all objects which were deprecated in version 3.0 (this change will be included in version 3.4). Given the time that has passed, and the fact that older unmaintained extensions are not likely to support the new minimum Python version, this is little concern about breaking older extensions.

Lines in 409 and 410 are part of an if-condition-block. However, they are called identically L411 and L412 outside of the if-block anyways. Fixes #1267.

By unescaping backslash escapes in a treeprocessor, the text is properly
escaped during serialization. Fixes #1131.

As it is recognized that various third-party extensions may be calling the
old class at `postprocessors.UnescapePostprocessor` the old class remains
in the codebase, but has been deprecated and will be removed in a future
release. The new class `treeprocessors.UnescapeTreeprocessor` should be
used instead.

Cleaned up the release notes.