Breaking: #67229 - FormEngine related classses

See Issue #67229

Description

With the further development of FormEngine, some minor changes on PHP level have been applied:

• Class TYPO3\CMS\T3editor\FormWizard has been removed
• Class TYPO3\CMS\Rtehtmlarea\Controller\FrontendRteController has been removed
• The method signature of class TYPO3\CMS\Utility\BackendUtility method getSpecConfParts has changed

Impact

Using code will fatal or not be called any longer.

Affected Installations

If extensions use above classes or methods. Since these classes are mostly core internal it is quite unlikely any project in the wild is affected.

Migration

Use the newly introduced API.