PHP 8 compatibility, TYPO3 11/12 compatibility

[seitenformate]

The extension is working with TYPO11 and PHP 7.4. With PHP 8 it is also working but there are some deprecation warnings like "Deprecated: Optional parameter $isunicode declared before required parameter $currentfont is implicitly treated as a required parameter ...".

[vmans]

Upgrade for compatibility with 12LTS and with respect to the already known changes for version 13.

If this extension t3_tcpdf does the job already, please put that in the documentation.

https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog-12.html
https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog-13.html

Publish a schedule, a plan of action.