feat: moves isConnectionInterrupted to lib-jitsi-meet.

JitsiConference.js

     // We need to know if the potential issue happened before or after
     // the restart.
     this.wasStopped = false;
+
+    /**
+     * The object which monitors local and remote connection statistics (e.g.
+     * sending bitrate) and calculates a number which represents the connection
+     * quality.
+     */
     this.connectionQuality
         = new ConnectionQuality(this, this.eventEmitter, options);
+
+    /**
+     * Indicates whether the connection is interrupted or not.
+     */
+    this.connectionIsInterrupted = false;
+
 }
 
 /**
     this.sendEndpointMessage("", payload);
 };
 
+JitsiConference.prototype.isConnectionInterrupted = function () {
+    return this.connectionIsInterrupted;
+};
+
 module.exports = JitsiConference;

JitsiConferenceEventManager.js

         JitsiConferenceEvents.CONFERENCE_JOINED);
     // send some analytics events
     chatRoom.addListener(XMPPEvents.MUC_JOINED,
-        function ()
-        {
-            for (var ckey in chatRoom.connectionTimes){
-                var cvalue = chatRoom.connectionTimes[ckey];
-                Statistics.analytics.sendEvent('conference.' + ckey,
-                    {value: cvalue});
+        () => {
+            let key, value;
+
+            this.conference.connectionIsInterrupted = false;
+
+            for (key in chatRoom.connectionTimes){
+                value = chatRoom.connectionTimes[key];
+                Statistics.analytics.sendEvent('conference.' + key,
+                    {value: value});
             }
-            for (var xkey in chatRoom.xmpp.connectionTimes){
-                var xvalue = chatRoom.xmpp.connectionTimes[xkey];
-                Statistics.analytics.sendEvent('xmpp.' + xkey,
-                    {value: xvalue});
+            for (key in chatRoom.xmpp.connectionTimes){
+                value = chatRoom.xmpp.connectionTimes[key];
+                Statistics.analytics.sendEvent('xmpp.' + key,
+                    {value: value});
             }
-        });
+    });
 
     this.chatRoomForwarder.forward(XMPPEvents.ROOM_JOIN_ERROR,
         JitsiConferenceEvents.CONFERENCE_FAILED,
     this.chatRoomForwarder.forward(XMPPEvents.CONNECTION_INTERRUPTED,
         JitsiConferenceEvents.CONNECTION_INTERRUPTED);
     chatRoom.addListener(XMPPEvents.CONNECTION_INTERRUPTED,
-        function () {
+        () => {
             Statistics.sendEventToAll('connection.interrupted');
+            this.conference.connectionIsInterrupted = true;
         });
 
     this.chatRoomForwarder.forward(XMPPEvents.RECORDER_STATE_CHANGED,
     this.chatRoomForwarder.forward(XMPPEvents.CONNECTION_RESTORED,
         JitsiConferenceEvents.CONNECTION_RESTORED);
     chatRoom.addListener(XMPPEvents.CONNECTION_RESTORED,
-        function () {
+        () => {
             Statistics.sendEventToAll('connection.restored');
+            this.conference.connectionIsInterrupted = false;
         });
 
     this.chatRoomForwarder.forward(XMPPEvents.CONFERENCE_SETUP_FAILED,