[!!!][TASK] Deprecate FormEngine::getLL()

This patch deprecates FormEngine::getLL() and removes
the dependency from all form element classes.

Resolves: #63878
Releases: master
Change-Id: I3f247a7241fb587d0a3c5a0a36b62968140f84c8
Reviewed-on: http://review.typo3.org/35468
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Markus Klein <klein.t3@reelworx.at>