* Add missing source files to MSVC project files.
* Resolve environment variables in include directive in
configuration file.
* Throw exception on nonexistent properties file, if requested by
fThrow flag.
* Generate pkgconfig file with CMake.
* Add locale support to ConsoleAppender.
* Initialize thread pool for async logging on demand.
* SysLogAppender: Allow non-FQDN hostname in syslog messages.
* Update Catch2 to v2.13.9.
- Run tests at buildtime
- Add source validation and update keyring
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/log4cplus?expand=0&rev=20
