Z3c.layer.ready2go

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.5, 3.6.

- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

- Drop deprecated support to run the tests via ``python setup.py test``.

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- Pin Python support to 2.7, 3.5, 3.6 and PyPy.

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- Added support for Python 3.3.

- Changed ``zope.testbrowser`` tests to ``WebTest``, since ``zope.testbrowser``
is not yet ported.

- Replaced deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Dropped support for Python 2.4 and 2.5.


- Fixed test setup and tests to run with current versions of the
required packages.

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- Adjusted dependencies, skiped dependency on `zope.app.publisher` and
`zope.app.http` and reflected changes in Zope packages.

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- Fix tests to work with latest packages.