* readme manager initial setup
This PR makes the README ready to be managed by the readme manager. It adds custom comment tags to the readme, which are invisible when the README is rendered, but tell the readme manager where to insert and update content.
* Update README.md
* Respect `RTCIceTransportPolicy` enum and organize
* Simplify syntax where possible etc.
* Combine `VideoPreset` and `VideoPresets`
* Default values for `ConnectOptions`
* Build URI instead of String manipulation
* Slight modifications to Exception
* `LiveKitTheme` for example
* `VideoEncoding` class
* Organize imports
* First simulcast implementation
* Remove unnecessary try-catches
* Update Android settings
* Remember uri and token
* example improvements
* `fit` parameter for VideoTrackRenderer
* Simulcast option for example
* Pass `defaultPublishOptions`
* Show only `VideoQuality`
* Pass tests
* Better buildUri logic
* Named parameter to positional
* Explicit imports
* `VideoParameter` instead of `VideoPreset`
* Use `mediaTrack.getSettings` when possible
* Safer dispose logic
* Safer `PCTransport`
Update transport.dart
* Synchronized events for `SignalClient`
* Use logger instead of print
* Make example compile for iOS
* First screen share implementation
* Make example work with screen share
* Example improvement
* Code optimization
* Don't depend on web_socket_channel
* Fix: Unpublish track bug
* Show participant mute state & identity
* Update protos
* Remote mute/unmute
* iOS Background mode
* Separate `createCameraTrack` and `createScreenTrack`
* Clean up
* PB fix
* format
* Fix analyzer warning
* Android clean up
* Update README.md
* Clean up
