[TASK] Remove extdeveval class

The class contains code which does not work.
Not working code is not needed, so we remove this file now.

Releases: 2.0.0
Change-Id: I9d4effba73743c958b950d44388b60420374d98e
Reviewed-on: https://review.typo3.org/31583
Reviewed-by: Alexander Schnitzler <typo3@alexanderschnitzler.de>
Tested-by: Alexander Schnitzler <typo3@alexanderschnitzler.de>