The remoteDispatchClientRequest() method is currently hardwired to
assume there is only one type of incoming message, a method call.
To allow for alternate types of incoming messags, the code that is
specific to method calls is being split into a separate method
remoteDispatchClientCall
* qemud/dispatch.c: Move method call specific code out into
remoteDispatchClientCall. Add a helper remoteSerializeError
for returning error messages to client
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