MIMEDefang 3.0

• Split mimedefang.pl code in Perl modules
• Add re_match_in_7zip_directory to check for files inside 7zip archives
• Switch to Digest::SHA
• Use new Rspamd connection method
• Add anonymize_uri to remove utm_* parameters from URIs
• Add md_dkim_sign and md_dkim_verify to manipulate DKIM signatures
• Add is_public_ip6_address to check if an IPv6 address is local
• Add md_authres method to generate a basic Authentication-Results header for the message
• Add md_arc_sign method to sign email messages with DKIM ARC signatures
• Add md_dkim_verify method to verify DKIM signatures