add improved btGeneric6DofSpring2Constraint, thanks to Puhr Gabor and Tamas Umenhoffer!

improved the new demo testbed (work-in-progress)
add basic Lua demo, import URDF test, STL import, obj import

Demos3/AllBullet2Demos/GwenTextureWindow.h

@@ -0,0 +1,32 @@
+
+
+#ifndef GWEN_TEXTURE_WINDOW_H
+#define GWEN_TEXTURE_WINDOW_H
+
+struct MyGraphInput
+{
+	struct GwenInternalData* m_data;
+	int m_xPos;
+	int m_yPos;
+	int m_width;
+	int m_height;
+	int m_borderWidth;
+	const char* m_name;
+	const char* m_texName;
+	MyGraphInput(struct GwenInternalData* data)
+	:m_data(data),
+	m_xPos(0),
+	m_yPos(0),
+	m_width(400),
+	m_height(400),
+	m_borderWidth(0),
+	m_name("GraphWindow"),
+	m_texName(0)
+	{
+	}
+};
+struct MyGraphWindow* setupTextureWindow(const MyGraphInput& input);
+void destroyTextureWindow(MyGraphWindow* window);
+
+
+#endif //GWEN_TEXTURE_WINDOW_H