- Remove SendAndWaitForResponse(), there is no need for a timeout that
ends the stream. We have other means of checking if the connection to
the server was lost.

- Don't wrap ProcessNonBlocking(), a server can send multiple stanzas
in one packet, wraping this methods means we process callbacks after
processing all stanzas in the packet. Which can lead to processing stanzas
not in arrival order. Instead process callbacks inside dispatch().