message: Support admin configurable message when reporting content
  This adds support for an admin-configured message in config.json to be shown in
  the report content dialog to allow linking to community rules, etc.
  Fixes
diff: @@ -20,6 +20,8 @@ import { _t } from '../../../languageHandler';
  import PropTypes from "prop-types";
  import {MatrixEvent} from "matrix-js-sdk";
  import {MatrixClientPeg} from "../../../MatrixClientPeg";
  +import SdkConfig from '../../../SdkConfig';
  +import Markdown from '../../../Markdown';
  /*
  * A dialog for reporting an event.
  @@ -95,6 +97,15 @@ export default class ReportEventDialog extends PureComponent {
  );
  }
  + const adminMessageMD =
  + SdkConfig.get().reportEvent &&
  + SdkConfig.get().reportEvent.adminMessageMD;
  + let adminMessage;
  + if (adminMessageMD) {
  + const html = new Markdown(adminMessageMD).toHTML();
  + adminMessage = <p dangerouslySetInnerHTML={{ __html: html }} />;
  + }
  +
  return (
  <BaseDialog
  className="mx_BugReportDialog"
  @@ -110,7 +121,7 @@ export default class ReportEventDialog extends PureComponent {
  "administrator will not be able to read the message text or view any files or images.")
  }
  </p>
  -
  + {adminMessage}
  <Field
  id="mx_ReportEventDialog_reason"
  className="mx_ReportEventDialog_reason"
  