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`

pubspec.yaml

@@ -10,72 +10,24 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-
-  collection: ^1.15.0
-  fixnum: ^1.0.0
-
   flutter_webrtc: ^0.6.7
-
   http: ^0.13.3
-  logging: ^1.0.1
-  protobuf: ^2.0.0
-
-  tuple: ^2.0.0
-  
+  logging: ^1.0.2
   uuid: ^3.0.4
   synchronized: ^3.0.0
-  
-  # 
+  protobuf: ^2.0.0
+
   # 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
-  
+
 dev_dependencies:
   flutter_test:
     sdk: flutter
   flutter_lints: ^1.0.4
-
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
-# The following section is specific to Flutter.
-flutter:
-
-  # To add assets to your package, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
-  #
-  # For details regarding assets in packages, see
-  # https://flutter.dev/assets-and-images/#from-packages
-  #
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware.
-
-  # To add custom fonts to your package, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts in packages, see
-  # https://flutter.dev/custom-fonts/#from-packages