Version 0.2.0

• Use import_resouces to access data more reliably
• Fix YAML loading safety issues
• Use src layout
• Use setup.cfg and drop custom version/readme code
• Use PEP 517 builds if available
• Generate version from git tags, include in sdist/wheels
• Remove test / pytest runners from setup.py
• Loading Config file api uses class method instead of magic global
• Use GitHub Actions to make releases - universal wheel only