[TASK] Deprecate GeneralUtility:readLLfile

readLLfile() was just a wrapper around LocalizationFactory.
This is resolved now by adapting all calls and moving a left
over code snippet to the factory method.

Resolves: #68122
Releases: master
Change-Id: Ib416e380f25b06a055b7f25103e19925b29d7fde
Reviewed-on: http://review.typo3.org/41197


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>