Z3c.sqlalchemy

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- Add support for Python 3.5-3.9.

- Standardize namespace __init__.

- Fix to work with zope.sqlalchemy 1.2.

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- Remove compatibility code with older Zope versions.

- Fix import issue with modern zope.component versions.

- Fix registering of custom mappers.

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- Don't create a new MetaData in LazyMapperCollection,
but use the one created in the wrapper.
In some cases, you could have some tables in the metadata created in the wrapper,
and some tables in the metadata created in the LazyMapperCollection,
which gave an error when trying to create relations.

- When generating the mapper class, make sure table.name is a string.
It can be unicode when use_unicode=1 with MySQL engine.

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- removed SA deprecation warning

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- made 'twophase' configurable

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- replace asDict() with a dictish proxy implementation