Merge branch 'RemoveF_FE_feGroup' into 'develop'

Documentation/Form.rst

docker/db_fixture_qfq.sql

extension/Classes/Core/Database/DatabaseUpdate.php

extension/Classes/Core/Database/DatabaseUpdateData.php

extension/Classes/Sql/qfqDefaultTables.sql

extension/Resources/Private/Form/copyForm.json

extension/Resources/Private/Form/cron.json

extension/Resources/Private/Form/form.json

extension/Resources/Private/Form/formElement.json

extension/Resources/Private/Form/formJson.json

...sion/Tests/Unit/Core/Database/fixtures/TestFormEditor.sql