[TASK] Move persistence.classes to global scope

By moving the class mapping in TS to the global scope
of extbase, users can use the class names also outside
of the extension.

Change-Id: Ic2c4f2556ab42d0192f0eb8ed10114b2bfef5161
Resolves: #62294
Reviewed-on: http://review.typo3.org/33346
Reviewed-by: Sebastian Fischer <typo3@evoweb.de>
Tested-by: Sebastian Fischer <typo3@evoweb.de>