ssldump 1.9

• Unused debug info removed
• Original pcap timestamps instead of timeofday-generated fix
• Add ECH
• Add TLS version 1.3 handling
• Set packet type for RAW PCAPs
• Enable DEBUG flag differently
• Doc update
• Add handlers for signals USR1 & 2
• Remove unnecessary parens in return statements
• Initialize variables
• Remove unused variables
• Fix warning unused for unused variable & error handling
• Add missing return statements
• Use correct cmake GNUInstallDirs variables with their built-in defaults
• Convert old-style function definitions
• Fix null analyzer instantiation