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

Change-Id: I04d98913a47a4fa42a85b16d5ff444672a4fa382
Reviewed-on: http://review.typo3.org/34250
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>