v0.3.0

This is a complete top-to-bottom rewrite, that is much more robust and portable than before, and also includes a much-improved asynchronous I/O mechanism.

Plus:

• C++20 wrapper (include/bal.hh)
• Both C and C++ test rigs (not yet complete)

I wouldn't call this "production ready." The test rigs need to be fleshed out further, I need to add additional platforms/compilers to the CI pipeline, and I need to write documentation (probably will go with Doxygen). However, this build should be good enough to tinker with and learn the ropes. Check out the files in the sample directory for guidance.

Thanks for your interest in libbal (SAL is reborn)!