Flag structural components as replaceable

src/components/structures/ScrollPanel.js

@@ -19,6 +19,7 @@ import PropTypes from 'prop-types';
 import { Key } from '../../Keyboard';
 import Timer from '../../utils/Timer';
 import AutoHideScrollbar from "./AutoHideScrollbar";
+import {replaceableComponent} from "../../utils/replaceableComponent";
 
 const DEBUG_SCROLL = false;
 
@@ -83,6 +84,7 @@ if (DEBUG_SCROLL) {
  * offset as normal.
  */
 
+@replaceableComponent("structures.ScrollPanel")
 export default class ScrollPanel extends React.Component {
     static propTypes = {
         /* stickyBottom: if set to true, then once the user hits the bottom of