Gensaschema

*) Emit separate PG enum objects. Thanks to happyraul and armonge for the PRs.

*) Run black formatter

*) Update project boilerplate

*) Adaptions for SA 2.0

*) Update project boilerplate

*) Add support for Identity server default

*) Update project boilerplate

*) Add support for SQLAlchemy 1.4

*) Update python support: 2.7, 3.6+

*) Add tests to source distribution

*) Update doc format

*) Update project boilerplate

*) Fix a repr() issue with sqlalchemy 1.3 (2)

*) Remove support for Python 3.3

*) Docs are no longer installed locally

*) Adapt to latest sphinx version

*) Fix setup in C locale