Uncompyle6

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Lots of changes major changes. track xdis API has changes.

Separate Phases more clearly:
* disassembly
* tokenization
* parsing
* abstracting to AST (more is done in newer projects)
* printing

Although we do not decompile bytecode greater than 3.8, code supports running from up to 3.12.

Many bugs fixed.

A lot of Linting and coding style modernization.

Work done in preparation for Blackhat Asia 2024

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* deparse generator expressions for Python 3.0 .. 3.2
* Python 3.0 list comprehension.
* Fix Issues 310, 344, 377, 391, 409, 414
* Limited support for 3.8+ f-string "=" specifier
* Correct 2.5-7 relative import formatting
* Miscellaneous bug fixing
* remove \n in lambda
* Python 2.6 grammar cleanup
* Correct some Python 2.6 chain compare decompilation
* Ensure no parenthesis subscript slices
* Correct 2.x formatting "slice2" nonterminal
* Correct 3.7 imports
* Improve "async for" parsing
* Handle BUILD_MAP opcode
* match Python AT better
* Correct 3.7 positional args
* PyPy 3.7 and PyPy 3.8 support
* Miscellaneous linting, isorting, blacking

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* Better handling of invalid bytecode magic
* Support running from 3.9 and 3.10 although we do not support those bytecodes
* Redo version comparisons using tuples instead of floats. This is needed for Python 3.10
* Split out into 3 branches so that the master branch can assume Python 3.6+ conventions, especially type annotations
* Source Fragment fixes
* Lambda-bug fixes 360
* Bug fixes

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* Fragment parsing was borked. This means deparsing in trepan2/trepan3k was broken
* 3.7+: narrow precedence for call statement
* del_stmt -> delete to better match Python AST
* 3.8+ Add another `forelsestmt` (found only in a loop)
* 3.8+ Add precedence on walrus operator
* More files blackened
* bump min xdis version

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Mostly small miscellaneous bug fixes

* `__doc__ = DocDescr()` from `test_descr.py` was getting confused as a docstring.
* detect 2.7 exchandler range better
* Add for .. else reduction checks on 2.6 and before
* Add reduce check for 2.7 augmented assign
* Add VERSION in a pydoc-friendly way

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* Use newer xdis
* Docstrings (again) which were broken again on earlier Python
* Fix 2.6 and 2.7 decompilation bug in handling "list if" comprehensions