TYPO3 RTE: Automatically add class to <ul> tag
- RTE: https://docs.typo3.org/m/typo3/reference-tsconfig/10.4/en-us/PageTsconfig/Rte.html
- HTMLParser: https://docs.typo3.org/m/typo3/reference-typoscript/10.4/en-us/Functions/Htmlparser.html
- Tags: https://docs.typo3.org/m/typo3/reference-typoscript/master/en-us/Functions/HtmlparserTags.html#htmlparser-tags
