[stdlib-sig] reorganizing xmlrpc and adding json/jsonrpc

[Ronny Pfannschmidt]

hi,

I propose adding a json lib in combination with a reorganisation of xmlrpc in order to support jsonrpc either by choice of the programmer or content-type neogation.

This mostly requires a json lib that's able to marshal jsonrpc requests/responses sharing the api of the xmlrpclib and some simple content-type choice in the rpcserver.

additional changes could be the reimplementation in terms of wsgi instead of having separate cgi/http server implementations and recreating the original api in terms of the wsgiref cgi/standalone handlers.

I'm looking forward to comments on this.

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Ronny Pfannschmidt