fix(spot) adapt to API changes and fix remote screen-share

modules/proxyconnection/ProxyConnectionService.js

 import { $iq } from 'strophe.js';
 
 import { MediaType } from '../../service/RTC/MediaType';
+import { getSourceNameForJitsiTrack } from '../../service/RTC/SignalingLayer';
 import { VideoType } from '../../service/RTC/VideoType';
 import RTC from '../RTC/RTC';
 
             receiveVideo: false
         });
 
+        localTracks.forEach((localTrack, localTrackIndex) => {
+            const localSourceNameTrack = getSourceNameForJitsiTrack('peer', localTrack.getType(), localTrackIndex);
+
+            localTrack.setSourceName(localSourceNameTrack);
+        });
+
         this._peerConnection.start(localTracks);
     }
 

modules/xmpp/XmppConnection.js

     /**
      * See {@link Strophe.Connection.addHandler}
      *
-     * @returns {void}
+     * @returns {Object} - handler for the connection.
      */
     addHandler(...args) {
-        this._stropheConn.addHandler(...args);
+        return this._stropheConn.addHandler(...args);
+    }
+
+    /**
+     * See {@link Strophe.Connection.deleteHandler}
+     *
+     * @returns {void}
+     */
+    deleteHandler(...args) {
+        this._stropheConn.deleteHandler(...args);
     }
 
     /* eslint-disable max-params */