feat(audio-recording): Handles conference properties sent from jicofo and play notification.

When audio-recording is enabled server-side play the recording audio and visual notification.

conference.js

@@ -27,6 +27,7 @@ import {
     conferenceJoinInProgress,
     conferenceJoined,
     conferenceLeft,
+    conferencePropertiesChanged,
     conferenceSubjectChanged,
     conferenceTimestampChanged,
     conferenceUniqueIdSet,
@@ -1759,6 +1760,10 @@ export default {
             JitsiConferenceEvents.LOCK_STATE_CHANGED,
             (...args) => APP.store.dispatch(lockStateChanged(room, ...args)));
 
+        room.on(
+            JitsiConferenceEvents.PROPERTIES_CHANGED,
+            properties => APP.store.dispatch(conferencePropertiesChanged(properties)));
+
         room.on(JitsiConferenceEvents.KICKED, (participant, reason, isReplaced) => {
             if (isReplaced) {
                 // this event triggers when the local participant is kicked, `participant`