DolphinQt: Add separate Free Look tab for rotation

Source/Core/DolphinQt/Config/Mapping/FreeLookRotation.h

@@ -0,0 +1,26 @@
+// Copyright 2021 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "DolphinQt/Config/Mapping/MappingWidget.h"
+
+class QGridLayout;
+
+class FreeLookRotation final : public MappingWidget
+{
+  Q_OBJECT
+public:
+  explicit FreeLookRotation(MappingWindow* window);
+
+  InputConfig* GetConfig() override;
+
+private:
+  void LoadSettings() override;
+  void SaveSettings() override;
+  void CreateMainLayout();
+
+  // Main
+  QGridLayout* m_main_layout;
+};