0.1.0-beta3

• Upgrade GCC 13.2
• Upgrade Python 3.12.0rc1
• Add Pybind11 master and cross
• Improved Python locator in CMake toolchain files
• Moved CMake and py-build-cmake files up one folder
• Enable PyPy 3.7
• Stripped down Python 3.12 install
• Determine Python EXT_SUFFIX and debug ABI in toolchain file

Full Changelog: 0.1.0-beta2...0.1.0-beta3