TYPO3 v12 support

Bugfixes

• [BUGFIX] Correct controller action redirects (01.08.2023, 6df09b2 by Roman Büchler)

Breaking changes

• [TASK][!!!] Change markdown parser (02.06.2023, 6c12c2f by Roman Büchler)

  Description

  The markdown parser from erusev/parsedown didn't
  get updates anymore. As a result it has been replaced
  with league/commonmark. The new parser doesn't
  provide a configuration option to convert line breaks
  into br-tags. Instead two tailing spaces can be used
  on the preceding row.

  Corrective action

  Add two trailing spaces to leading rows.