Breaking: #3 - Plugins are migrated from list_type to CType

Description

According to the TYPO3 documentation we have changed all plugins to the recommended CType variant. Because this is a breaking change, we have provided an upgrade wizard to migrate all existing plugins.

https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/ContentElements/MigrationListType.html