Include list of connected clients in server desync logs

Save full date including fractional part in NetworkClientInfo

src/network/network_base.h

@@ -26,6 +26,8 @@ struct NetworkClientInfo : NetworkClientInfoPool::PoolItem<&_networkclientinfo_p
 	std::string client_name; ///< Name of the client
 	CompanyID client_playas; ///< As which company is this client playing (CompanyID)
 	Date join_date;          ///< Gamedate the client has joined
+	DateFract join_date_fract;
+	uint8 join_tick_skip_counter;
 
 	/**
 	 * Create a new client.