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
 * Fixed nDPIsrvd bug which causes invalid JSON strings sent to Distributors
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