updated demos -> ALT + mouse uses Maya-style controls, replaced BMF_Fonts by GLDebugFont

fix debug drawing of btMultiSphereShape
added box2d demo
added experimental gpu 2d demo

Demos/OpenGL/GlutStuff.cpp

@@ -65,7 +65,7 @@ static void glutDisplayCallback(void)
 	gDemoApplication->displayCallback();
 }
 
-
+#ifndef _WINDOWS
 int glutmain(int argc, char **argv,int width,int height,const char* title,DemoApplication* demoApp) {
     
 	gDemoApplication = demoApp;
@@ -97,3 +97,5 @@ int glutmain(int argc, char **argv,int width,int height,const char* title,DemoAp
     glutMainLoop();
     return 0;
 }
+
+#endif //_WINDOWS