[TASK] Use new class name for tslib_cObj

Releases: 2.0.0
Change-Id: Ia61c5e0e42128f78c937dfd7ae148164c352e5ee
Reviewed-on: http://review.typo3.org/32113
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>