Put presenter state in conference manager

src/ConferenceCallManager.js

@@ -247,6 +247,7 @@ export class ConferenceCallManager extends EventEmitter {
       stream,
       audioMuted: this.audioMuted,
       videoMuted: this.videoMuted,
+      presenter: false,
     };
 
     this.participants.push(this.localParticipant);
@@ -400,6 +401,17 @@ export class ConferenceCallManager extends EventEmitter {
     this.emit("participants_changed");
   }
 
+  setPresenter(userId, presenter) {
+    const participant = this.participants.find(
+      (participant) => participant.userId === userId
+    );
+
+    if (participant) {
+      participant.presenter = presenter;
+      this.emit("participants_changed");
+    }
+  }
+
   logout() {
     localStorage.removeItem("matrix-auth-store");
   }
@@ -533,6 +545,7 @@ export class ConferenceCallManager extends EventEmitter {
         stream,
         audioMuted,
         videoMuted,
+        presenter: false,
       };
       this.participants.push(participant);
     }
@@ -632,6 +645,7 @@ export class ConferenceCallManager extends EventEmitter {
         stream: null,
         audioMuted: false,
         videoMuted: false,
+        presenter: false,
       };
       // TODO: Should we wait until the call has been answered to push the participant?
       // Or do we hide the participant until their stream is live?