Breaking: #69401 - Adopt ext:form to support the Extbase/ Fluid MVC stack

See forge#69401


The postProcessor interface and the mail postProcessor have changed.

Validators and filters have been moved to other folders and both class names and algorithms have changed.


Own postProcessors, validators and filters will possibly fail with an error.

Affected Installations

Installations with own postProcessors, validators and filters.


Adopt own postProcessors, validators and filters to comply with the current implementation.