httpgateway: take listen/port data from config file

gateway/httpgateway.h

@@ -13,6 +13,10 @@ class HttpGateway : public GatewayInterface
 	httplib::Response convertResponse(Response response);
 	Request convertRequest(httplib::Request request);
 	//  void worker(const httplib::Request& req, httplib::Response& res);
+
+	std::string listenaddr;
+	int listenport;
+
   public:
 	HttpGateway(const Config &config);
 	bool keepReading() override;