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This PR adds a mapping driver factory, orm.mapping.factory, following the same pattern as orm.cache.factory.
It supports custom mapping drivers like it has been proposed for cache drivers in #59.
The factory methods requires a Configuration instance to be passed. This is only used by the "annotation" driver and could be avoided by inlining the code in Doctrine\ORM\Configuration::newDefaultAnnotationDriver(). This would make the API cleaner but create make a stronger coupling to Doctrine ORM, so I kept the existing implementation. Agree?