TYPO3 v14 support

[fnagel]

Update extension for TYPO3 CMS 14 LTS.

Current master branch should be ready for testing in TYPO3 14.0.x!
Please test and give feedback!

References

• https://get.typo3.org/release-notes/14.0.0
• https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog-14.html