Create IWindowManager to open window from libopenrct2

src/openrct2/ui/DummyWindowManager.cpp

@@ -0,0 +1,30 @@
+#pragma region Copyright (c) 2014-2017 OpenRCT2 Developers
+/*****************************************************************************
+* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+*
+* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
+* For more information, visit https://github.com/OpenRCT2/OpenRCT2
+*
+* OpenRCT2 is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* A full copy of the GNU General Public License can be found in licence.txt
+*****************************************************************************/
+#pragma endregion
+
+#include "WindowManager.h"
+
+namespace OpenRCT2 { namespace Ui
+{
+    class DummyWindowManager final : public IWindowManager
+    {
+        rct_window * OpenWindow(rct_windowclass wc) override { return nullptr; }
+    };
+
+    IWindowManager * CreateDummyWindowManager()
+    {
+        return new DummyWindowManager();
+    }
+} }