Subscriber as primary (#8)

* Update protos

* Signal client

* Improve transport

* First implementation

* Fix publish

* Update `PCTransport` for debounce negotiation

* debounce func

* reconnect & events

* Update debounce func

* engine events

* make sure events don't emit after dispose

* prefix flutter_webrtc

* Cleaner `iceServers` update

* don't mutate user provided params

* fix tests

* event manager

* Fix: `Room.onDisconnected` gets fired multiple times

* data publish in example

* cleaner logic

* safer events

* un-prefix with LK

* organize imports

* Clean up

* remove `Tuple`

* `EventsEmitter` can now be directly listened to

`EventsEmitter` extends `EventsListenable`

example/lib/pages/room.dart

@@ -1,3 +1,4 @@
+import 'dart:convert';
 import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
@@ -6,6 +7,7 @@ import 'package:provider/provider.dart';
 
 import '../widgets/controls.dart';
 import '../widgets/participant.dart';
+import '../exts.dart';
 
 class RoomPage extends StatefulWidget {
   //
@@ -17,13 +19,10 @@ class RoomPage extends StatefulWidget {
   }) : super(key: key);
 
   @override
-  State<StatefulWidget> createState() {
-    return _RoomPageState();
-  }
+  State<StatefulWidget> createState() => _RoomPageState();
 }
 
 class _RoomPageState extends State<RoomPage> with RoomDelegate {
-  // BuildContext? _lastContext;
   //
   List<Participant> participants = [];
 
@@ -107,13 +106,15 @@ class _RoomPageState extends State<RoomPage> with RoomDelegate {
     });
   }
 
+  @override
+  void onDataReceived(RemoteParticipant participant, List<int> data) async {
+    await context.showDataReceivedDialog(utf8.decode(data));
+  }
+
   @override
   void onDisconnected() {
-    // final context = _lastContext;
     print('disconnected: $context');
-    // if (context != null) {
     Navigator.pop(context);
-    // }
   }
 
   @override