Move dispatcher into a subdirectory

We're expecting to have a whole bunch of types for the dispatched payloads, so pull the thing into a directory we can throw them in.

src/components/structures/UploadBar.js

@@ -19,7 +19,7 @@ import React from 'react';
 import createReactClass from 'create-react-class';
 import PropTypes from 'prop-types';
 import ContentMessages from '../../ContentMessages';
-import dis from "../../dispatcher";
+import dis from "../../dispatcher/dispatcher";
 import filesize from "filesize";
 import { _t } from '../../languageHandler';