- Add onUrlLoaded callback to WebViewWidgetMessageInterceptor
- Add WebViewAudioManager component and use it instead of the AudioManager extension functions
- Enable controlling the audio devices in Element Call from the OS instead of automatically detecting them
- Simplify the window flags in ElementCallActivity
- Work around the issue where the default audio device wasn't using the right audio stream
- Add onAudioPlaybackStarted, use it to start the audio-device related logic
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