[!!!][TASK] Remove support for TYPO3 4.5-6.1

Change-Id: Ie4efc2f5119bebc4b8b960b87a1b31ac507f63b0
Reviewed-on: http://review.typo3.org/35045
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>