Qt: Improve updater

Source/Core/DolphinQt2/Updater.h

@@ -0,0 +1,24 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QThread>
+
+#include "UICommon/AutoUpdate.h"
+
+class QWidget;
+
+class Updater : public QThread, public AutoUpdateChecker
+{
+  Q_OBJECT
+public:
+  explicit Updater(QWidget* parent);
+
+  void run() override;
+  void OnUpdateAvailable(const NewVersionInformation& info) override;
+
+private:
+  QWidget* m_parent;
+};