Py-build-cmake

- Improved documentation: https://tttapa.github.io/py-build-cmake/
- Perform environment variable substitution before generating build hooks
- Fix verbose output on Python 3.7

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.4.1...0.4.2

- Produce a warning when `MACOSX_DEPLOYMENT_TARGET` is set in the py-build-cmake config (43)
- Support appending and prepending to environment variables

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.4.0...0.4.1

- `MACOSX_DEPLOYMENT_TARGET` support:
Its value is now used to determine the Wheel platform tag on macOS, and the target version is passed on to CMake.
- Improved documentation.

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.3.4...0.4.0

- Improved `MACOSX_DEPLOYMENT_TARGET` support.
- Merged all host platform information into a single dataclass that is used throughout the build, rather than directly querying global information that could depend on environment variables etc.

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.3.4...0.4.0a0

- Add CI tests
- Build Wheels for more platforms

**Full Changelog**: https://github.com/tttapa/py-build-cmake-example/compare/0.3.4...0.3.4.post1

- Added more `PY_BUILD_CMAKE_*` variables.
- Renamed `PY_BUILD_CMAKE_MODULE_NAME` → `PY_BUILD_CMAKE_IMPORT_NAME`, `PY_BUILD_CMAKE_PACKAGE_NAME` → `PY_BUILD_CMAKE_PROJECT_NAME`, `PY_BUILD_CMAKE_PACKAGE_VERSION` → `PY_BUILD_CMAKE_PROJECT_VERSION`
(the old variables are still available for backwards compatibility).
- More robust CMake FindPython hints.
- New _Variables_ reference: https://tttapa.github.io/py-build-cmake/Variables.html
- Simplified minimal example CMakeLists.txt.
- Improved documentation.

**Full Changelog**: https://github.com/tttapa/py-build-cmake/compare/0.3.3...0.3.4