~fsx/cbare

OpenBSD 7.6 isn't available yet.
Fix test function prototypes.
Update CI configuration.
Fix linking in Makefile.
Add missing bool header.
Re-add license.
Rewrite cbare.

- Don't depende on Meson and Python.
- Simplify (de)serialization APIs.
- Simplify tests (don't generate from text files).
- Add a man page (cbare.3).
- Build on OpenBSD.
Use error_is_set.
Update TODO.
Add build status to readme.
Add Arch Linux build.
Add Alpine build script.
Fix bugs spotted by doanalyze.sh.
Add UTF-8 check.
Update README.
Zero before use.
Buildable in clang.
Add more scripts.
Next