Update to 0.7.0a1 (RHBZ#2220464 RHBZ#2226306)
- Build from master branch
- Use forge macros for that
- Drop patches (no longer required)
- Clean up BRs
- Switch to pytest and fix command (unknown option '-n')
- Move BR python3-sphinx into conditional
- Use Cython < 3.0.0 (compat package)
- Clean up BRs for testing (python3-pytest-flake8 is retired)
- Tests now require python3-cartopy
- Generate docs in %install