Route the game's own RakNet UDP through the ghost relay so real internet
peers can play, with the server as a pure relay/NAT stabilizer:
- XNetTransport: a rexglue relay client (joins the same relay + room as the
ghost client), a receive thread, and:
- SendGame(): wraps a datagram addressed to a virtual 10.80.0.x peer in a
relay Game payload and sends it OUTBOUND to the relay (no inbound
reachability / port forwarding needed).
- QuerySessions()/Sessions(): discovery - the room members that
XNetQosLookup reports to the game's session search.
- Receive injection: relayed Game payloads are pushed into the game's
registered sockets via XSocket::QueuePacket.
- XSocket: SendTo() to a virtual address routes through the transport;
RecvFrom() drains queued relayed packets first; sockets register with the
transport on Initialize.
- XNetQosLookup: queries the relay and returns the room's members as
discovered sessions (with their virtual addresses), signaling completion.
- XNetGetTitleXnAddr identity now shares one source of truth with the
transport (same 10.80.0.x).
Wire structs are minimal copies of the game's ghost protocol (kept
dependency-free); the relay's version check refuses mismatches.
