add option to create mp4 videos from App_AllBullet2Demos, using the

--mp4=video.mp4 note that you have to re-convert for Quicktime
ffmpeg  -f mp4 -vcodec h264 -i test.mp4 -pix_fmt yuv420p test2.mp4
add the option to display text in 3d, used in Coriolis demo

btgui/Bullet3AppSupport/CommonPhysicsSetup.h

@@ -55,6 +55,11 @@ struct GraphicsPhysicsBridge
 	virtual void autogenerateGraphicsObjects(btDiscreteDynamicsWorld* rbWorld) 
 	{
 	}
+    
+    virtual void drawText3D( const char* txt, float posX, float posZY, float posZ, float size)
+    {
+        
+    }
 };
 
 ///Bullet 2 specific physics setup, that allows to share code between old and new demo frameworks