Merge branch 'dev' into 'next'

ajax/backend/independent/getItemTypes.php

bin/Controls/Independent/MenuManagement.js

bin/Controls/Independent/MenuPanel.Create.html

bin/Controls/Independent/MenuPanel.ItemCard.html

bin/Controls/Independent/MenuPanel.css

bin/Controls/Independent/MenuPanel.js

locale.xml

src/QUI/Menu/Independent/Handler.php

src/QUI/Menu/Independent/Items/AbstractMenuItem.php

src/QUI/Menu/Independent/Items/Anchor.php

src/QUI/Menu/Independent/Items/Custom.php

src/QUI/Menu/Independent/Items/Site.php

src/QUI/Menu/Independent/Items/Url.php