Proof of concept & ping example work.

One call takes c.3msec (5000 calls over 14209 msecs) with 2+2 serialization/deserialization
TODO
* Profile if there is huge troubles on .NET side other that serialization
* If serialization is the bottleneck then change the library. But we a limited to JSON, probably rethink Envelop/Message
* Must avoid double serialization on Lua side: in Ping case it was just a matter of escapes

Ping round trip MUST take less then 1 msec. The math is latency of sockets on local host + (de)serialization. It is TOO SLOW currently for almost empty payload.