Forms: Fix error message for fileuploads if a upload gets deleted
Formstaging: Fix an issue that an exported form without the (old) data property could not be imported.
Formstaging: Fixed a bug which leads to Formgrids not active anymore after an form import. In addition, the Formstaging export didn‘t contain the formgrid. This has been added to new exports.
Multi-Tenancy Feature: A new Feature (`feature_multi_tenancy`) is introduced. This allows to use different ActaNova Backend Systems in a single test ANDP instance. See Multi-Tenancy
Messages: If the published message does not contain a HTML content, the email content was previously empty, now it will use the content also if it‘s just plaintext
ANDP Admin Custom-Tool now only shows sections if the corresponding Feature is active