config: add ip:port part history save.

Gui/GuiUtil/Config.h

@@ -0,0 +1,31 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <QString>
+#include <Util.h>
+#include <nlohmann/json.hpp>
+#include <vector>
+using json = nlohmann::json;
+
+struct CgConnection {
+    std::string ip;
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE(CgConnection, ip);
+};
+
+using CgConVec = std::vector<CgConnection>;
+
+class FrelayConfig
+{
+public:
+    FrelayConfig();
+    ~FrelayConfig();
+
+public:
+    bool SaveIpPort(const QString& ipPort);
+    std::vector<QString> GetIpPort();
+
+private:
+    bool existFile(const std::string& path);
+};
+
+#endif   // CONFIG_H