Massive JavaScript cleanup

- Use JSX for templates
- Docblock/comment everything
- Mostly passes ESLint (still some work to do)
- Lots of renaming, refactoring, etc.

CSS hasn't been updated yet.

js/lib/helpers/humanTime.js

@@ -0,0 +1,19 @@
+import humanTimeUtil from 'flarum/utils/humanTime';
+
+/**
+ * The `humanTime` helper displays a time in a human-friendly time-ago format
+ * (e.g. '12 days ago'), wrapped in a <time> tag with other information about
+ * the time.
+ *
+ * @param {Date} time
+ * @return {Object}
+ */
+export default function humanTime(time) {
+  const mo = moment(time);
+
+  const datetime = mo.format();
+  const full = mo.format('LLLL');
+  const ago = humanTimeUtil(time);
+
+  return <time pubdate datetime={datetime} title={full} data-humantime>{ago}</time>;
+}