MetaTrader v600 employs Unicode instead of Ansi. Changes made to

MetaTrader v600 employs Unicode instead of Ansi. Changes made to
mql4zmq.mqh to convert strings to uchar[] when sending to zmq, and
converting uchar[] to string when receiving.
Merge pull request #6 from ungratefulson/2.0.0-pre

MetaTrader build 600+ adds support for additional types and employs unicode instead of ansi when passing data to DLLs.