v2.1.0

• Throw exception on nonexistent properties file,
  if requested by fThrow flag.

• Generate pkgconfig file with CMake.

• Add locale support to ConsoleAppender. (Choy Kho Yee)

• Initialize thread pool for async logging on demand.

• SysLogAppender: Allow non-FQDN hostname
  in syslog messages.

• Update Catch2 to v2.13.9.

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