Issue #1849822 by dawehner: Convert (HTML) view rendering to a render array.

core/modules/rest/src/Plugin/views/display/RestExport.php

core/modules/shortcut/src/Tests/ShortcutLinksTest.php

core/modules/user/src/Tests/UserBlocksTest.php

core/modules/views/src/Annotation/ViewsDisplay.php

core/modules/views/src/Element/View.php

core/modules/views/src/Entity/View.php

core/modules/views/src/Plugin/Block/ViewsBlock.php

core/modules/views/src/Plugin/views/display/Attachment.php

...ules/views/src/Plugin/views/display/DisplayPluginBase.php

core/modules/views/src/Plugin/views/display/Feed.php

core/modules/views/src/Routing/ViewPageController.php

core/modules/views/src/ViewExecutable.php

...ules/views/tests/src/Unit/Plugin/Block/ViewsBlockTest.php

...s/views/tests/src/Unit/Routing/ViewPageControllerTest.php

core/modules/views/views.theme.inc