[!!!][TASK] Add compatibilty for TYPO3 13

Breaking-Changes:
 removed support for TYPO3 11
 removed support for TYPO3 12

Tasks:
 Initial upgrade
 setup dev environment
 rector upgrades
 Internalize Algorithm DataHandler::isTableAllowedForThisPage because this became protected
 removing TYPO3 11 code
 phpstan lvl 8
 update version number
 Update ext_emconf.php
 added better baseline
 Update README.md

Resolves: 56