Preview release 2022-03-24

Python Wheels built on GitHub, for CPython 3.6, 3.7, 3.8, and 3.9, with Lua 5.1.

For Linux with Clang and libstdc++, with glibc 2.31.
For MacOS with Clang and libc++.

The build is now performed with optimisations, which was missed accidentally in the previous release.