Various changes throughout the system improving
method annotations here and there or sanitizing
code a bit better.

Change-Id: Ieeee41ede160e301a59aa8a534ca26e3499a4fcd
Resolves: #83612
Releases: master
Reviewed-on: https://review.typo3.org/55411

Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Reiner Teubner <reiner.teubner@me.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>