Merge branch 'feature_frontend_filters' into 'master'

Classes/Controller/VimeoController.php

Classes/Event/AfterFilterVideosEvent.php

Classes/Event/AfterMapCustomThumbnailsEvent.php

Classes/Event/AfterVimeoCallEvent.php

Classes/Event/BeforeVimeoCallEvent.php

Classes/Filter/DurationFilter.php

Classes/Filter/FilterInterface.php

Classes/Filter/FilterParameterBag.php

Classes/Filter/QueryStringFilter.php

Classes/Preview/PreviewService.php

Classes/Service/LicenceCheckService.php

Classes/Service/VimeoService.php

Classes/Upgrades/ThumbnailsUpgradeWizard.php

Classes/Utility/FlexFormUtility.php

Classes/ViewHelpers/PictureViewHelper.php

Configuration/FlexForms/flexform_sgvimeo_vimeo.xml

Configuration/TypoScript/constants.typoscript

Configuration/TypoScript/setup.typoscript

README.md

Resources/Private/Language/de.locallang.xlf