Implement an alternate syntax for "Explicit Token Types". Uses a generic two-argument syntax and allows escaping of characters using the common excaping rules. For this to work the AlgPseudocodeLexer is now based on Pygment's ExtendedRegexLexer instead of RegexLexer.

.. -*- coding: utf-8; indent-tabs-mode: nil; -*-

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 Overview
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The package contains the following lexers:

.. raw:: latex

   {\footnotesize

.. include:: ../lexerlist.rst

.. raw:: latex

   }