InputCommon: move Setting classes out of ControlGroup

Source/Core/InputCommon/ControllerEmu/Setting/BackgroundInputSetting.h

@@ -0,0 +1,20 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "InputCommon/ControllerEmu/Setting/BooleanSetting.h"
+
+namespace ControllerEmu
+{
+class BackgroundInputSetting : public BooleanSetting
+{
+public:
+  BackgroundInputSetting(const std::string& setting_name);
+
+  bool GetValue() const override;
+  void SetValue(bool value) override;
+};
+
+}  // namespace ControllerEmu