Qt: Implement graphics window and controls

Source/Core/DolphinQt2/Config/Graphics/GraphicsSlider.h

@@ -0,0 +1,23 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QSlider>
+
+namespace Config
+{
+template <typename T>
+struct ConfigInfo;
+};
+
+class GraphicsSlider : public QSlider
+{
+public:
+  GraphicsSlider(int minimum, int maximum, const Config::ConfigInfo<int>& setting, int tick = 0);
+  void Update(int value);
+
+private:
+  const Config::ConfigInfo<int>& m_setting;
+};