Qt/Settings: Implement "GameCube pane"

Source/Core/DolphinQt2/Settings/GameCubePane.h

@@ -0,0 +1,33 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QWidget>
+
+class QCheckBox;
+class QComboBox;
+class QPushButton;
+
+class GameCubePane : public QWidget
+{
+public:
+  explicit GameCubePane();
+
+private:
+  void CreateWidgets();
+  void ConnectWidgets();
+
+  void LoadSettings();
+  void SaveSettings();
+
+  void OnConfigPressed(int slot);
+
+  QCheckBox* m_skip_main_menu;
+  QCheckBox* m_override_language_ntsc;
+  QComboBox* m_language_combo;
+
+  QPushButton* m_slot_buttons[2];
+  QComboBox* m_slot_combos[3];
+};