Refactored to use proxy - got rid of fragmented_udp_gateway, now io_base has a pluggable proxy interface where we can easily add handlers for each method in the gateway -- extremely useful when relay is to be implemented
Moved fragmentation and proxies to shared - so that we can use the same tools in our rendezvous server and not just interagent
Setup rendezvous server to also use UDPGateway - fragmented messages TO and FROM the rendezvous server?!?? oh yeaaa 😉 also this commit + the proxies === should make implementing relay extra smoooooth