Created basic physics-based OpenGL menu dialog system, with toggle/text and slider control.

Demos/OpenGL/GLDebugFont.h

@@ -17,6 +17,9 @@ subject to the following restrictions:
 #ifndef BT_DEBUG_FONT_H
 #define BT_DEBUG_FONT_H
 
+#include "LinearMath/btVector3.h"
+
+void	GLDebugDrawStringInternal(int x,int y,const char* string,const btVector3& rgb);
 void	GLDebugDrawString(int x,int y,const char* string);
 void	GLDebugResetFont(int screenWidth,int screenHeight);