[FEATURE] Add a Format.Case ViewHelper

This adds a Format.Case ViewHelper that changes
a string's case in various manners like uppercase,
lowercase, (un-)capitalization and
each-word-capitalization.

Resolves: #58621
Releases: master
Change-Id: I182fae00a8bf11b6188e73bdd9cf15011ed3620d
Reviewed-on: http://review.typo3.org/36913


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>