Fixed Windows client streams, C++ compilation and added fast loopback path for Windows

[kterhorst]

• Made client streams work on Windows (AF_UNSPEC => AF_INET)
• Made the source code compilable in C++ mode
• Added fast TCP loopback path for Windows (for Windows Server 2012, Windows 8 and higher)

[perefm]

in order to make it compatible with vs 2017, you should change the line:
#include <windows.h> /* For SOCKET */
for:
#include <winsock2.h> /* For SOCKET */
in file dyad.h, line 14.

Thanks!