Implemented the real server

src/game_server/InternalGameServer.h

@@ -6,6 +6,7 @@
 namespace FRG {
 
 class LocalGameServerHost;
+class RemoteGameServerHost;
 struct LocationConfig;
 
 // In-process implementation used by single-player.  GameState exists exactly
@@ -30,6 +31,7 @@ public:
 
 private:
 	friend class LocalGameServerHost;
+	friend class RemoteGameServerHost;
 
 	// Host-only lifecycle operations. They never expose authoritative state and
 	// are intentionally absent from IGameServer.