v0.8.5.1

Changelog:

BREAKING changes:

• POSIX-compatible configuration and parameters (double-dash instead of original single-dash)
• Parameter documentation overhaul
• Go 1.16 minimum required
• Major changes to configuration scheme, and convert the config to ini format
• Changed priority order for arguments, env variables and ini file (see README.md for more details)

Minor changes:

• Clickhouse Output now defaults to type 0 (no output to Clickhouse by default)
• Standardize input and outputs for Kafka
• Upgraded Grafana to 8.0
• Added Syslog Output
• HEC output rework for multiple endpoints
• Code cleanups and performance improvements
• Domain check logic is now case-insensitive
• Wiki kick-off (PRs most welcome)