Webpack (#1367)

* Replace gulp with webpack and npm scripts for JS compilation
* Set up Travis CI to commit compiled JS
* Restructure `js` directory; only one instance of npm, forum/admin are "submodules"
* Refactor JS initializers into Application subclasses
* Maintain partial compatibility API (importing from absolute paths) for extensions
* Remove minification responsibility from PHP asset compiler
* Restructure `less` directory

js/src/forum/components/DiscussionRenamedPost.js

@@ -0,0 +1,34 @@
+import EventPost from './EventPost';
+import extractText from '../../common/utils/extractText';
+
+/**
+ * The `DiscussionRenamedPost` component displays a discussion event post
+ * indicating that the discussion has been renamed.
+ *
+ * ### Props
+ *
+ * - All of the props for EventPost
+ */
+export default class DiscussionRenamedPost extends EventPost {
+  icon() {
+    return 'fas fa-pencil-alt';
+  }
+
+  description(data) {
+    const renamed = app.translator.trans('core.forum.post_stream.discussion_renamed_text', data);
+    const oldName = app.translator.trans('core.forum.post_stream.discussion_renamed_old_tooltip', data);
+
+    return <span title={extractText(oldName)}>{renamed}</span>;
+  }
+
+  descriptionData() {
+    const post = this.props.post;
+    const oldTitle = post.content()[0];
+    const newTitle = post.content()[1];
+
+    return {
+      'old': oldTitle,
+      'new': <strong className="DiscussionRenamedPost-new">{newTitle}</strong>
+    };
+  }
+}