OpenWrt, OSX and *BSD

 * Added Event I/O abstraction layer (supporting only poll/epoll by now).
 * Support for OSX and *BSD systems.
 * Added proper DLT_RAW dissection for IPv4 and IPv6.
 * Improved TCP timeout handling if FIN/RST seen which caused Midstream TCP flows when there shouldn't be any.
 * Fixed a crash if `nDPId -o value=''` was used.
 * Added OpenWrt packaging.
 * Added new flow event "analyse" used to give some statistical information about active flows.
 * Added new analyse event daemon which generates CSV files from such events.
 * Fixed a crash in nDPIsrvd if a collector closes a connection.
 * Support `nDPId` to send it's data to a UDP endpoint instead of a nDPIsrvd collector.
 * Added events and flow states documentation.
 * Added basic systemd support.
 * Fixed a bug in base64 encoding which could lead to invalid base64 strings.
 * Added some machine learning examples.
 * Fixed various smaller bugs.
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