Fixed warnings in Bullet/src core library

Thanks Martijn Reuvers from Two Tribes B.V. (www.twotribes.com) for the patch

To make this work more visible, suppress warnings in external libraries in Extras (COLLADA_DOM, libxml and glui contain many warnings)
Added PreprocessorDefinitions: _CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE to vcproj files

src/BulletCollision/CollisionDispatch/btCollisionObject.h

@@ -84,7 +84,7 @@ protected:
 
 	char	m_pad[7];
 
-	virtual bool	checkCollideWithOverride(btCollisionObject* co)
+	virtual bool	checkCollideWithOverride(btCollisionObject* /* co */)
 	{
 		return true;
 	}