DolphinQt / InputCommon: Support multiple DSU servers

Source/Core/DolphinQt/Config/ControllerInterface/DualShockUDPClientAddServerDialog.h

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+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QDialog>
+
+class QDialogButtonBox;
+class QGridLayout;
+class QLineEdit;
+class QSpinBox;
+
+class DualShockUDPClientAddServerDialog final : public QDialog
+{
+  Q_OBJECT
+public:
+  explicit DualShockUDPClientAddServerDialog(QWidget* parent);
+
+private:
+  void CreateWidgets();
+  void OnServerAdded();
+
+  QDialogButtonBox* m_buttonbox;
+  QGridLayout* m_main_layout;
+  QLineEdit* m_description;
+  QLineEdit* m_server_address;
+  QSpinBox* m_server_port;
+};