Modulegraph2

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* Fix incompatibility with recent setuptools versions

* Fix incompatibility with Python 3.11

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* Enhance the support for setuptools vendored packages
to also work with pkg_resources (which uses the same
mechanism).

* Fix graphbuilding problem when using "setuptools",
"pkg_resources" or "six".

* Fix test failures with recent python versions, failures
were due to imperfect test hygiene.

* Add a *code* attribute to :class:`modulegraph2.Script`
and :class:`modulegraph2.Module`, containing the compiled
bytecode for the module (or *None*)

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* 11: ``ModuleGraph.add_script`` did not work reliably

* Add support for the way setuptools locates vendored
packages (``setuptools.extern.VendorImporter``)

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* No functional changes

* Migrated to GitHub

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Fixed a number of issues:

* Test suite now passes on Windows

* Test suite now passes on Linux

* Test suite now passes with Python 3.6

* Implemented automated tested on Windows and Linux
using AppVeyor. MacOS is manually tested for
now as that's my main development platform.

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Initial pre-release. This version should be
functionally complete, but hasn't been used
by other code yet.