- Use requirements.txt to install dependencies to local venv.
- Use setup.py to build/install example packages to local venv.
- Adjust reference-doc-builder to new Python pkg imports.
This might give Python devs an easier time than if all the sample
code lived deep inside a gradle project. This means there is
no root project gradle build file; the reference-doc-builder and
java-examples modules are separate java projects, with their own
build files.
