Moved Traversal Client code over from old netplay

Moved over gui code for copying host code
added gui to netplay diag setup to switch between direct and traversal connection

Source/Core/Common/TraversalProto.h

@@ -0,0 +1,96 @@
+// This file is public domain, in case it's useful to anyone. -comex
+
+#pragma once
+#include <array>
+#include "Common/CommonTypes.h"
+
+
+typedef std::array<char, 8> TraversalHostId;
+typedef u64 TraversalRequestId;
+
+enum TraversalPacketType
+{
+	// [*->*]
+	TraversalPacketAck = 0,
+	// [c->s]
+	TraversalPacketPing = 1,
+	// [c->s]
+	TraversalPacketHelloFromClient = 2,
+	// [s->c]
+	TraversalPacketHelloFromServer = 3,
+	// [c->s] When connecting, first the client asks the central server...
+	TraversalPacketConnectPlease = 4,
+	// [s->c] ...who asks the game host to send a UDP packet to the
+	// client... (an ack implies success)
+	TraversalPacketPleaseSendPacket = 5,
+	// [s->c] ...which the central server relays back to the client.
+	TraversalPacketConnectReady = 6,
+	// [s->c] Alternately, the server might not have heard of this host.
+	TraversalPacketConnectFailed = 7
+};
+
+enum
+{
+	TraversalProtoVersion = 0
+};
+
+enum TraversalConnectFailedReason
+{
+	TraversalConnectFailedClientDidntRespond = 0,
+	TraversalConnectFailedClientFailure,
+	TraversalConnectFailedNoSuchClient
+};
+
+#pragma pack(push, 1)
+struct TraversalInetAddress
+{
+	u8 isIPV6;
+	u32 address[4];
+	u16 port;
+};
+struct TraversalPacket
+{
+	u8 type;
+	TraversalRequestId requestId;
+	union
+	{
+		struct
+		{
+			u8 ok;
+		} ack;
+		struct
+		{
+			TraversalHostId hostId;
+		} ping;
+		struct
+		{
+			u8 protoVersion;
+		} helloFromClient;
+		struct
+		{
+			u8 ok;
+			TraversalHostId yourHostId;
+			TraversalInetAddress yourAddress; // currently unused
+		} helloFromServer;
+		struct
+		{
+			TraversalHostId hostId;
+		} connectPlease;
+		struct
+		{
+			TraversalInetAddress address;
+		} pleaseSendPacket;
+		struct
+		{
+			TraversalRequestId requestId;
+			TraversalInetAddress address;
+		} connectReady;
+		struct
+		{
+			TraversalRequestId requestId;
+			u8 reason;
+		} connectFailed;
+	};
+};
+#pragma pack(pop)
+