Merge remote-tracking branch 'origin/master' into feature_security_update

Classes/Controller/ConfigurationController.php

Classes/Controller/MailController.php

Classes/Controller/QueueController.php

Classes/XClass/Form/FormEditorController.php

Classes/XClass/Form/FormManagerController.php

Configuration/Yaml/Forms/FinisherSetupBE.yaml

Resources/Private/Language/de.locallang.xlf

Resources/Private/Language/locallang.xlf

Resources/Private/Layouts/Default.html

Resources/Private/Layouts/NoMenu.html

Resources/Private/Layouts/Queue.html

Resources/Private/Templates/Configuration/Index.html

Resources/Private/Templates/Mail/Index.html

composer.json

ext_emconf.php

ext_localconf.php

ext_tables.php