Redesign video player (#4911)

* Redesign video player

* Use new video player on static public pages too

* Use media gallery component on static public pages too

* Pause video when hiding it

* Full-screen sizing on WebKit

* Add aria labels to video player buttons

* Display link card on public status page

* Fix fullscreen from modal sizing issue

* Remove contain: strict property to fix fullscreen from columns

app/javascript/mastodon/containers/media_gallery_container.js

@@ -0,0 +1,34 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { IntlProvider, addLocaleData } from 'react-intl';
+import { getLocale } from '../locales';
+import MediaGallery from '../components/media_gallery';
+import { fromJS } from 'immutable';
+
+const { localeData, messages } = getLocale();
+addLocaleData(localeData);
+
+export default class MediaGalleryContainer extends React.PureComponent {
+
+  static propTypes = {
+    locale: PropTypes.string.isRequired,
+    media: PropTypes.array.isRequired,
+  };
+
+  handleOpenMedia = () => {}
+
+  render () {
+    const { locale, media, ...props } = this.props;
+
+    return (
+      <IntlProvider locale={locale} messages={messages}>
+        <MediaGallery
+          {...props}
+          media={fromJS(media)}
+          onOpenMedia={this.handleOpenMedia}
+        />
+      </IntlProvider>
+    );
+  }
+
+}