Qt/Mapping: Add support for exclusive boolean settings

Source/Core/DolphinQt2/Config/Mapping/MappingRadio.h

@@ -0,0 +1,29 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QRadioButton>
+
+class MappingWidget;
+
+namespace ControllerEmu
+{
+class BooleanSetting;
+};
+
+class MappingRadio : public QRadioButton
+{
+public:
+  MappingRadio(MappingWidget* widget, ControllerEmu::BooleanSetting* setting);
+
+  void Clear();
+  void Update();
+
+private:
+  void Connect();
+
+  MappingWidget* m_parent;
+  ControllerEmu::BooleanSetting* m_setting;
+};