* android: webrtc calls notification and alert
* add ringtone to incoming call
* incoming call on full screen
* enable notification ringtone
* remove text
* use translated strings in call notification
* use simplex.chat relay
* update webrtc settings
* WebRTCView to use command/response types
* compress WebRTC session descriptions, simple web UI for calls
* update webrtc ui
* use webworked in desktop browser
* use RTCRtpScriptTransform in safari
* update android type
* refactor
* add await
* mobile: webrtc calls state machine
* android: call api types
* android: call api methods
* ios: connect calls via chat UI (WIP)
* ios: webrtc call connects via UI
* core: update call duration/status when x.call.end is received
* improve call UX/UI
* audio calls
* different overlay for audio calls
* toggle video/audio in the call