[TASK] Cleanup EXT:taskcenter

Resolves: #67861
Releases: master
Change-Id: I18531f6ef4d9541e9ef1163c3b4703f6b37bc84c
Reviewed-on: http://review.typo3.org/40769


Reviewed-by: Stephan Großberndt <stephan@grossberndt.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>