We do this by manually managing the RTCAudioSession.
Unfortunately to do this we have to include a couple of RTC headers not
exported by the default build of WebRTC.framework (see: Libraries/WebRTC)
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This is an effort to better define boundaries and simplify
relationships.
This also fixes a theoretical problem where CallKit was showing the in-app
call screen before the call was successfully answered, now we wait until
the action is fulfilled.
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In the process, extracted the CallDelegate to allow the
CAllViewController to observe useful call state properties (call.state
and call.isMuted)
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* Ensure NotificationsManager has dependencies
Otherwise it's easy to mess up the order of the required dependencies.
* move AccountManager into Environment, it's heavy to construct
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