Code refactor, support multiple gateways and non-SAML authentication (#9)

* Code refactor

* Update README.md

GPClient/loginparams.h

@@ -0,0 +1,44 @@
+#ifndef LOGINPARAMS_H
+#define LOGINPARAMS_H
+
+#include <QUrlQuery>
+
+class LoginParams
+{
+public:
+    LoginParams();
+    ~LoginParams();
+
+    void setUser(const QString &user);
+    void setServer(const QString &server);
+    void setPassword(const QString &password);
+    void setUserAuthCookie(const QString &cookie);
+    void setPrelogonAuthCookie(const QString &cookie);
+    void setPreloginCookie(const QString &cookie);
+
+    QByteArray toUtf8() const;
+
+private:
+    QUrlQuery params {
+        {"prot", QUrl::toPercentEncoding("https:")},
+        {"server", ""},
+        {"inputSrc", ""},
+        {"jnlpReady", "jnlpReady"},
+        {"user", ""},
+        {"passwd", ""},
+        {"computer", QUrl::toPercentEncoding(QSysInfo::machineHostName())},
+        {"ok", "Login"},
+        {"direct", "yes"},
+        {"clientVer", "4100"},
+        {"os-version", QUrl::toPercentEncoding(QSysInfo::prettyProductName())},
+        {"clientos", "Linux"},
+        {"portal-userauthcookie", ""},
+        {"portal-prelogonuserauthcookie", ""},
+        {"prelogin-cookie", ""},
+        {"ipv6-support", "yes"}
+    };
+
+    void updateQueryItem(const QString &key, const QString &value);
+};
+
+#endif // LOGINPARAMS_H