QFQ encrypt/decrypt WIP: created new class for encryption and decryption of strings. Implemented multiple functions to handle these data. Prepared formEditor.sql and formElement.json for new feature

S13657 Added two new twig report files to system: FormEditorTwig and autoCronTwig. Documentation added for setup of these new files.

Refs #12145 create form with json form editor. Fix unicode error. Fix form file sync (even though disabled). Throw errors if json encode/decode fails. Put form backups into folder named by form id.

This reverts commit d2054269

Add extension/Resources/Private/composer.json again. Makefile: add composer update again. Necessary to deliver phpoffice in extension/Resources/Private/vendor/phpoffice.

F4922 / Excel Import: moved Lib again - to get the autoloader running, we need the composer inside our extension - else we would need the one delivered by typo3, which will result in more effort to integrate in QFQ.

Report.php: include DataImport.php, new column type 'import'.
DataImport.php: created.
QuickFormQuery.php: globally includepath extended.