Switch to new event system (#9)

* `SignalEvents` and `synchronized` mode for `EventsListenable`

* cascade syntax

* clean up

* `RoomEvents`

* `ParticipantEvents`

* all events implemented

* make it compile with M1 macs

* dispose logic

* cleaner connect logic

* ask to publish

* fix initial EngineTrackAddedEvent glitch

* fix unpublishTrack bug

* clean up

* better events docs

* organize event types

* clean up

* cleaner wait logic

* wait for event instead of using Completer

* notifyListeners

example/lib/pages/connect.dart

@@ -62,6 +62,9 @@ class _ConnectPageState extends State<ConnectPage> {
         _busy = true;
       });
 
+      // Save for next time
+      await _writePrefs();
+
       print('Connecting with url: ${_uriCtrl.text}, token: ${_tokenCtrl.text}...');
 
       final room = await LiveKitClient.connect(
@@ -74,9 +77,6 @@ class _ConnectPageState extends State<ConnectPage> {
         ),
       );
 
-      // Save for next time
-      await _writePrefs();
-
       await Navigator.push<void>(
         ctx,
         MaterialPageRoute(builder: (_) => RoomPage(room)),
@@ -122,10 +122,14 @@ class _ConnectPageState extends State<ConnectPage> {
               mainAxisSize: MainAxisSize.min,
               children: [
                 TextField(
+                  enableSuggestions: false,
+                  autocorrect: false,
                   controller: _uriCtrl,
                   decoration: const InputDecoration(labelText: 'URL'),
                 ),
                 TextField(
+                  enableSuggestions: false,
+                  autocorrect: false,
                   controller: _tokenCtrl,
                   decoration: const InputDecoration(labelText: 'Token'),
                 ),