* enable use of setuptools-embedded distutils
* list 3.10 support
* remove setup.cfg (and deprecated metadata in it)
* run tests on ephemeral copy of intermediate build bits
The wheel package format supports including the license file. This is
done using the [metadata] section in the setup.cfg file. For additional
information on this feature, see:
https://wheel.readthedocs.io/en/stable/index.html#including-the-license-in-the-generated-wheel-file
Distributing the wheel now complies with the license:
> The above copyright notice and this permission notice shall be
> included in all copies or substantial portions of the Software.
