composer require --dev rector/rector:"^0.5.0"

This commit introduces the requirement to rector/rector to
automatically process code changes by given set of rules.

To make this commit more meaningful, a first set "php53"
has been processed.

Releases: master
Resolves: #89785
Change-Id: I6e2ff9654266458ae9fb6800547ff4712b0b66d8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62437


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>