Multiplayer: gracefully handle player loss unless it's a host

We don't want server to shutdown after just one of players lost the game.

lib/serializer/Connection.cpp

@@ -201,6 +201,11 @@ bool CConnection::isOpen() const
 	return socket && connected;
 }
 
+bool CConnection::isHost() const
+{
+	return connectionID == 1;
+}
+
 void CConnection::reportState(CLogger * out)
 {
 	out->debugStream() << "CConnection";

lib/serializer/Connection.h

@@ -74,6 +74,7 @@ public:
 
 	void close();
 	bool isOpen() const;
+	bool isHost() const;
 	template<class T>
 	CConnection &operator&(const T&);
 	virtual ~CConnection(void);