v2.2.3

Features

Implemented Dacs7Server as a PLCSimulator (currently only reading and writing of data areas is supported)
added more metadata methods
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fixed write item read result
disabled auto reconnect as long as rfc1006 has a connection
added connection semaphore so that not more then one call can be in process at the same time
changed metadata, if block does not exists, an empty metadata structure will be received, and no exception will be thrown, so you can also check the block availability with this command
fixed S7 AlarmSQ indication and Ack
changes on alarming: alarm update needs a disposable subscription, to also catch events which are arrived between processing.
creating docs and using win1252 encoding
added is socket connection to while loop, so we stopp receiving on socket disconnected.
fixed AsyncAutoresetEvent
optimized semaphore disposing
fixed bug in receive socket
changed receive buffer size
fixed read package size calculation for big data
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