New csf v14.19

Changes:

• Switch to using iptables-nft if it exists in /usr/sbin/iptables-nft
• Added IO::Handle::clearerr() call before reading data from a log file
• Added “Require all granted” to the MESSENGER .htaccess file
• Added UID/GID rules to IPv6 if enabled
• Modified dovecot regex to look for “failed: Connection reset by peer”