Dhparser

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- parse.py: The (insignificant) "Whitespace"-parser is now optional
per default. This simplifies writing regular expressions for
insignificant whitespace, but can lead to BREAKING badly formulated
grammars, because optional-testing during static analysis is now
more comprehensive.
- ebnf.py: bugfix for linefeed whitespace-parser and added line-start
whitespace-parser.
- parse.py: removed methods for combining parsers, i.e. turn cascades
of nested Series, Interleave or Alternative parsers into one
flat parser with a longer list of arguments, because these are
practically never needed and have undesired side effects.
- parse.py: Speed-Optimization by implementing simplified __call__-methods
for leaf-parsers and for parsers that do not memoize.
- parse.py: class LateBindingUnary added (experimental!)
- testing.py: allow to set config-values in test-files.
- EXPERIMENTAL: started a nim-rewrite of the parser core to increase
parser speed to the level of a compiled language, i.e. nim (nim-lang.org)

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- NEW: Macros for EBNF grammars added!
- better support for (post-)processing pipelines (dsl.py and compile.py)
- added an (autogenerated) ...App.py script that allows to select files
for compilation with a simple GUI. (This helps to deploy projects
for users that are not used to the command line.)
Like the ...Parser.py and ...Server.py-scripts, this script is
generated when running the grammar-tests-script for the first time in
a new project.
- refactoring of the template for autogenerated ...Parser.py-scripts
to make them shorter and more readable.
- autogenerated tst_..._grammar.py-script will generate ...Server.py
and ...App.py script only once and not regenerate them automatically
if they have been deleted. Pass "--scripts" on the command line to
re-create these scripts if needed.
- nodetree.py: support for SXML-serialization
(see https://okmij.org/ftp/Scheme/SXML.html)

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- faster parser: now uses text locations instead of string views to hand over
the rest of the document to the next parser. Approx 25% faster!
- Cython compatibility restored

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- New Requirement: Python 3.7 or greater!!!
(due to from __future__ import annoataions)
- EBNF-grammars can now refer to custom Python parsers
- EBNF-grammars can now attach errors to the syntax-tree directly,
e.g. number = digits | Error("Not A Number") /.*?\d/
- cython support moved to cython3, cython3 compatibility restored
- support for arbitrary data, i.e. not only tree-data in intermediary
steps of DHParser.compile-module's processing pipelines via optional
RootNode.data - attribute
- order of detailed manuals in documentation re-arranged

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- Moved to poetry-packaging <https://github.com/python-poetry/poetry>

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- refactoring of module parser.py for more simplicity. RE is now
a simple (macro-style) function instead of a class of its own.
Class Token has been merged with PlainText. Possible break of
backwards compatibility with certain AST-transformation-tables in
connection with Token and RE-nodes!