Add display name to chat message meta

JitsiConference.js

 JitsiConference.prototype.sendTextMessage = function(
         message, elementName = 'body') {
     if (this.room) {
-        this.room.sendMessage(message, elementName);
+        const displayName = (this.room.getFromPresence('nick') || {}).value;
+
+        this.room.sendMessage(message, elementName, displayName);
     }
 };
 

JitsiConferenceEventManager.js

 
             conference.eventEmitter.emit(
                 JitsiConferenceEvents.MESSAGE_RECEIVED,
-                id, txt, ts);
+                id, txt, ts, displayName);
         });
 
     chatRoom.addListener(

modules/xmpp/ChatRoom.js

         this.presMap.nodes.push(values);
     }
 
+    /**
+     * Retreives a value from the presence map.
+     *
+     * @param {string} key - The key to find the value for.
+     * @returns {Object?}
+     */
+    getFromPresence(key) {
+        return this.presMap.nodes.find(node => key === node.tagName);
+    }
+
     /**
      *
      * @param key