Py-build-cmake

- Make `[tool]` optional in `pyproject.toml`

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.0.13...0.0.14

- Use custom tags implementation based on PyPA `packaging` to get correct tags for PyPy.
- Respect `ARCHFLAGS` for cross-compilation on macOS.

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.0.12...0.0.13

- Support `--local` and `--cross` flags to specify configuration overrides.
- Improved CMake Python discovery when cross-compiling.
- Install Python stubs as subdirectories to allow for submodules in C extension modules.
- Various minor improvements.

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.0.11...0.0.12

- Support for Python 3.6 and 3.7

- Check absolute minumum CMake requirement
- Windows: properly escape backslashes editable paths
- Clearer configuration error messages

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.0.10...0.0.11

- Tag sdist with `py3` only instead of full version for pure Python packages

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.0.9...0.0.10