feat: override email, display name and avatar on mobile

Will override email, display name and avatar URL with the values
provided in 'context.user' structure of the JWT token.

Settings will no longer be used to retrieve local display name,
email and avatar URL. Now those values will be obtained from
the /features/base/participants Redux state.

fix(jwt/middleware): use const for default name

fix: wrong default display name on web

ref(base/participants): remove getDisplayName functions

ref(jwt): do not accept unknown user fields

react/features/speaker-stats/components/SpeakerStats.js

@@ -1,11 +1,12 @@
-/* global APP, interfaceConfig */
+/* global interfaceConfig */
 
 import PropTypes from 'prop-types';
 import React, { Component } from 'react';
+import { connect } from 'react-redux';
 
 import { Dialog } from '../../base/dialog';
 import { translate } from '../../base/i18n';
-
+import { getLocalParticipant } from '../../base/participants';
 import SpeakerStatsItem from './SpeakerStatsItem';
 import SpeakerStatsLabels from './SpeakerStatsLabels';
 
@@ -21,6 +22,12 @@ class SpeakerStats extends Component {
      * @static
      */
     static propTypes = {
+        /**
+         * The display name for the local participant obtained from the Redux
+         * store.
+         */
+        _localDisplayName: PropTypes.string,
+
         /**
          * The JitsiConference from which stats will be pulled.
          */
@@ -130,7 +137,7 @@ class SpeakerStats extends Component {
             const { t } = this.props;
             const meString = t('me');
 
-            displayName = APP.settings.getDisplayName();
+            displayName = this.props._localDisplayName;
             displayName = displayName ? `${displayName} (${meString})`
                 : meString;
         } else {
@@ -149,4 +156,26 @@ class SpeakerStats extends Component {
     }
 }
 
-export default translate(SpeakerStats);
+/**
+ * Maps (parts of) the Redux state to the associated SpeakerStats's props.
+ *
+ * @param {Object} state - The Redux state.
+ * @private
+ * @returns {{
+ *     _localDisplayName: string?
+ * }}
+ */
+function _mapStateToProps(state) {
+    const localParticipant = getLocalParticipant(state);
+
+    return {
+        /**
+         * The local display name.
+         * @private
+         * @type {string|undefined}
+         */
+        _localDisplayName: localParticipant && localParticipant.name
+    };
+}
+
+export default translate(connect(_mapStateToProps)(SpeakerStats));