0.8.1 (20230313)

- Fixed compiler error when NDEBUG is defined (Baruch Siach)
- When NDEBUG is defined exclude more unused code (fix warning, smaller binary)
- Fixed buglet: Only delete the pidfile/clientpidfile we created (James Abbatiello abbeyj at gmail.com)
- Added CODE_OF_CONDUCT.md
- Add LICENSES/* and .reuse/dep5 (REUSE 3.0 compliant)
- Add references to the codeberg repository