re2c: update to 2.2.

2.2 (2021-08-01)
~~~~~~~~~~~~~~~~

- Added named blocks and block lists in directives.

- Added local blocks ``/*!local:re2c ... */``.

- Added in-block ``!include`` directive.

- Added in-block ``!use`` directive.

- Allowed reusable blocks without ``-r --reusable`` option.

- Allowed customizing the generated code with configurations for directives
  ``max:re2c``, ``maxnmatch:re2c``, ``stags:re2c``, ``mtags:re2c`` and
  ``types:re2c`` (see directive descriptions for details).

- Forbid arbitrary text at the end of ``max:re2c`` directive. This may break
  backwards compatibility, although it is unlikely that this was used by anyone.
  The change was necessary in order to allow customization of the generated code
  with configurations.

- Deprecated configurations ``flags:i``, ``flags:no-debug-info`` in favour of
  the global options ``-i``, ``--no-debug-info``.

- Reimplemented re2c test runner in Python (thanks to
  `Serghei Iakovlev <https://github.com/sergeyklay>`_). Improved integration
  with GitHub Actions.

- Changes in the experimental libre2c library: added new algorithms that
  construct t-string or extract submatch on all repetitions; added TDFA
  benchmark written in Java by Angelo Borsotti.

- Updated documentation.


(wiz)