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/Bullet2RigidBodyDemo.cpp

@@ -275,6 +275,12 @@ struct MyGraphicsPhysicsBridge : public GraphicsPhysicsBridge
 			
 		}
 	}
+    
+    virtual void drawText3D( const char* txt, float posX, float posY, float posZ, float size)
+    {
+        btAssert(m_glApp);
+        m_glApp->drawText3D(txt,posX,posY,posZ,size);
+    }
 };
 
 Bullet2RigidBodyDemo::Bullet2RigidBodyDemo(CommonGraphicsApp* app, CommonPhysicsSetup* physicsSetup)