mqsocket

Extended mqsocket.dll functionalities based on http://www.mql5.com/en/code/169

Added functions:

uint SocketReadString(
                   SOCKET_CLIENT &cl,    
                   string &buffer,       
                   int   timeout_ms     
                   );

uint SocketWriteString_ExpectReply(
                   SOCKET_CLIENT &cl,   
                   string str,         
                   string &reply,       
                   int   timeout_ms     
                   );