Introduce a new API ClientRequestEx2 and make ClientRequestEx to be a macro calling ClientRequestEx2;
Introduce a new API ServerSendReplyEx and make ServerSendReply to be a macro calling ServerSendReplyEx;
Introduce a new API RegisterRequestHandlerV1 to register an extended request handler;
Introduce a new API GetRequestHandlerV1 to get the exteneded request handler;
Introduce a new API GetRequestHandlerEx to get the request handler and the version of the handler;
Tune the prototypes of sock_write_t and sock_read_t to use size_t, ssize_t, and DWORD for count, return value, and timeout value repectively.
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