Support PF\_RING and read/parse configuration files

 * Read and parse configuration files for nDPId (+ libnDPI) and nDPIsrvd
 * Added loading risk domains from a file (`-R`, thanks to @UnveilTech)
 * Added Filebeat configuration file
 * Improved hostname handling; will now always be part of `analyse`/`end`/`idle` events (if dissected)
 * Improved Documentation (INSTALL / Schema)
 * Added PF\_RING support
 * Improved nDPIsrvd-analyse to write global stats to a CSV
 * Added global (heap) memory stats for daemon status events (if enabled)
 * Fixed IPv6 address/netmask retrieval on some systems
 * Improved nDPIsrvd-collect; gauges and counters are now handled the right way
 * Added nDPId Grafana dashboard
 * Fixed `detection-update` event bug; was thrown even if nothing changed
 * Fixed `not-detected` event spam if detection not completed (in some rare cases)
 * Improved InfluxDB push daemon (severity parsing / gauge handling)
 * Improved zLib compression
 * Fixed nDPIsrvd-collectd missing escape character
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