Issue #1716908 by aspilicious, tim.plunkett: Use the new attributes system in D8.

css/views-admin.contextual.css

handlers/views_handler_field_contextual_links.inc

includes/admin.inc

js/views-contextual.js

tests/templates/views-view--frontpage.tpl.php

theme/theme.inc

theme/views-ui-display-tab-bucket.tpl.php

theme/views-ui-display-tab-setting.tpl.php

theme/views-view-grid.tpl.php

theme/views-view-list.tpl.php

theme/views-view-table.tpl.php

theme/views-view-unformatted.tpl.php

theme/views-view.tpl.php

views.module

views_ui.module