New upstream release.

• Add snat_prefix and dnat_prefix statements for IPv6-to-IPv6 Network Prefix Translation (NPTv6).
• Deprecate unneeded to after snat and dnat statements. It's quietly ignored.
• Add tproxy matcher for transparent proxying.
• Add mss pmtu to calculate the MTU in runtime based on what the routing cache has observed via Path MTU Discovery.
• Fix mss to apply to IPv4 and IPv6. Previously it was only for IPv4.
• Add input section. It processes incoming packets with destination localhost.
• Add try-reload command to safely test new config. It loads new config, asks confirmation from user to keep it, and reverts back to old config if user didn't reply within 15 seconds.
• Foomuuri Monitor supports and prefers fping's --squiet=s mode. It works correctly even if the interface is down. fping command option --interval=ms is automatically converted to --squiet=s if possible.
• Add command_down_interval and down_interval to Foomuuri Monitor. Foomuuri Monitor will run that external command in regular intervals if network connectivity is still down.
• Default log prefix can be configured with foomuuri { log_prefix "..." }.
• Variables $(szone), $(dzone) and $(statement) can be used in log prefix.
• More text to default log prefix can be added with log + "mytext".
• Multiple interfaces can be specified to iifname and oifname matchers. Negative matching also works.
• Use human readable output format in list counter command.
• Add prometheus, prometheus-* and alertmanager macros to default services.
• Add --fork command line option to fork as a background daemon process. This applies to monitor and dbus only.
• Add --syslog command line option to enable syslog logging.
• Add bash-completion (requires v2.12 or newer) script.