[TASK] Add TYPO3 12 Support and licence check

Classes/Controller/YoutubeController.php

Classes/EventListener/PluginRenderer.php

Classes/Hooks/PageLayoutView/PluginRenderer.php

Classes/Preview/PreviewRenderer.php

Classes/Service/ExtensionSettingsService.php

Classes/Service/LicenceCheckService.php

Configuration/Services.yaml

Resources/Private/Layouts/Default.html

Resources/Public/JavaScript/Dist/main.bundled.min.js

Resources/Public/JavaScript/Modules/sgVideoLightbox.js

Resources/Public/Sass/Modules/_sg-video.scss

Resources/Public/StyleSheets/main.min.css

ext_localconf.php