* 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
* mobile: webrtc calls in webview (typescript WIP)
* typsecript compiles
* fix error messages
* TS works in chrome
* include ICE candidates into offer/answer, report connection state changes to host, end call on disconnection
* refactor, readme for .js file