[!!!][TASK] Remove deprecated property mapper of Extbase

Extensions requiring rewrittenPropertyMapper = 0
may not work properly any more.

Releases: 6.3
Resolves: #57396
Change-Id: Id33a364194a9b6ff05301527df7a0af21b8d3807
Reviewed-on: http://review.typo3.org/28915


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