[FEATURE] Adds the TYPO3 7.6 support

Classes/BrowseLinks.php

Classes/Controller/BrowseLinksController.php

Classes/Controller/ImageRenderingController.php

Classes/Controller/SelectImageController.php

Classes/Extension/Typo3Link.php

Classes/FolderTree.php

Classes/Form/Element/RichTextElement.php

Classes/Form/Resolver/RichTextNodeResolver.php

Classes/Hook/SoftReferenceHook.php

Classes/PageTree.php

Classes/RteHtmlAreaApi.php

Classes/SelectImage.php

Configuration/Backend/Routes.php

Configuration/TinyMce/standard.js

Configuration/TypoScript/ImageRendering/setup.ts

Modules/BrowseLinks/conf.php

Modules/BrowseLinks/index.php

Modules/SelectImage/conf.php

Modules/SelectImage/index.php

Resources/Private/Language/locallang.xlf