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

* Code refactor

* Update README.md

GPClient/loginparams.cpp

@@ -0,0 +1,54 @@
+#include "loginparams.h"
+
+#include <QUrlQuery>
+
+LoginParams::LoginParams()
+{
+}
+
+LoginParams::~LoginParams()
+{
+}
+
+void LoginParams::setUser(const QString &user)
+{
+    updateQueryItem("user", user);
+}
+
+void LoginParams::setServer(const QString &server)
+{
+    updateQueryItem("server", server);
+}
+
+void LoginParams::setPassword(const QString &password)
+{
+    updateQueryItem("passwd", password);
+}
+
+void LoginParams::setUserAuthCookie(const QString &cookie)
+{
+    updateQueryItem("portal-userauthcookie", cookie);
+}
+
+void LoginParams::setPrelogonAuthCookie(const QString &cookie)
+{
+    updateQueryItem("portal-prelogonuserauthcookie", cookie);
+}
+
+void LoginParams::setPreloginCookie(const QString &cookie)
+{
+    updateQueryItem("prelogin-cookie", cookie);
+}
+
+QByteArray LoginParams::toUtf8() const
+{
+    return params.toString().toUtf8();
+}
+
+void LoginParams::updateQueryItem(const QString &key, const QString &value)
+{
+    if (params.hasQueryItem(key)) {
+        params.removeQueryItem(key);
+    }
+    params.addQueryItem(key, QUrl::toPercentEncoding(value));
+}