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Added an option to write down statistics to file or log by either sending SIGUSR1 to process, or automatically via separate thread.
Configurable by config file and startup parameters.
Simillar option is present on OpenVPN
https://openvpn.net/community-resources/reference-manual-for-openvpn-2-4/
And it is useful when application is running in background.
I will implement daemon mode in other PR.