Better audio management (#10)

* add audio_session package

* `AudioManager` initial design

* try to integrate audio manager

* configure audio session

* `DisposeAware`

disposing if already published causes exception.

* organize

* guard flutter_webrtc calls

* websocket async fix

* use `ConnectionState` instead of `_isClosed` and `isReconnecting`

* change create audio track defaults

* update protos

* protocol 3 speaker updates

* fix exception

* emit `RoomDisconnectedEvent` only once

* fix exception

* keep track of local / remote audio tracks

* explicit types

* manage track state

* re-structure audio management

* change defaults

* unpublish all

* use experimental build

* change defaults

* configuring is optional

* call native `RTCAudioSession.setConfiguration`

* defaults adjustment

* iOS only for now

* use lib 92.4515.07

* clean up

* revert audio options for now

* remove pod source

* rename apple related audio

* `createListener` method

* organize native audio

* `SpeakingChangedEvent` only on `Participant`

* refactoring

* fix ios compile

* fix configure audio only for iOS logic

* minor fix & clean up

* change dispose logic

* format protos

* fix unpublishTrack

* `createListener` into a mixin

* simplify

* use flutter_webrtc master

* unpublish for example

* update ios icon

* android icon

* web icon

* favicon

pubspec.yaml

@@ -16,28 +16,21 @@ dependencies:
   uuid: ^3.0.4
   synchronized: ^3.0.0
   protobuf: ^2.0.0
-
-  flutter_webrtc: 
-    git:
-      url: https://github.com/livekit/flutter-webrtc
-      ref: use-custom-webrtc-build
-
-    # ^0.6.7
-    # path: ../../repos_livekit/flutter-webrtc/
+ 
+  flutter_webrtc:
     # This will use custom webrtc build from
     # https://github.com/webrtc-sdk/Specs/releases
-
-  # protobuf:
-  #   git:
-  #     url: https://github.com/google/protobuf.dart.git
-  #     ref: master
-  #     path: protobuf/
-
-  # WebSocketChannel has design flaws
-  # https://github.com/dart-lang/web_socket_channel/issues/25
-  # web_socket_channel: ^2.1.0
+    git:
+      url: https://github.com/flutter-webrtc/flutter-webrtc
+      ref: master
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
   flutter_lints: ^1.0.4
+
+flutter:
+  plugin:
+    platforms:
+      ios:
+        pluginClass: LiveKitClientPlugin