Version 0.3.0

[tttapa]

• Improved configuration file format
• Command-line overrides
  (fixes Q: Passing CMake variables on the command line #23)
• Support multiple CMake build trees per package
• PEP 420 namespace package support
• Reproducible builds
• Multiple editable installation modes
• Editable build hook mode that automatically re-builds extension modules
• Cross-compilation workflow documentation
• Extensive testing (unit tests, package content checks, cibuildwheel tests)
• Pre-commit Ruff and Mypy checks
• Better error reporting
• CMake preset support (e.g. Conan)
  (fixes CMake presets functionality seems to be broken #33)
• Allow overriding Wheel tags
  (fixes Feature: support wheel build tag #32)
• Support guessing Wheel tags based on the current platform
  (fixes Q: how to automatically detect platform_tag? #29, Bug: MACOSX_DEPLOYMENT_TARGET is not respected  #31)
• Support ABI3 Wheels
  (fixes Support abi3 wheel tag for stable ABI #36)
• Pass a virtual environment's Ninja path to CMake explicitly
  (fixes unable to build as path dependency when build tool is not globally installed #25)
• Automatic CIBW cross-compilation support for macOS and Windows on ARM
• Drop flit_core dependency
• Remove convoluted cross.copy_from_native_build option
• Improve CMake FindPython hints