Otherwise, the RoomWidgetClient class can end up accidentally sending and receiving events from rooms it didn't intend to, if it's an always-on-screen widget.
* WIP RoomWidgetClient
* Wait for the widget API to become ready before backfilling
* Add support for sending user-defined encrypted to-device messages
This is a port of the same change from the robertlong/group-call branch.
* Fix tests
* Emit an event when the client receives TURN servers
* Expose the method in MatrixClient
* Override the encryptAndSendToDevices method
* Add support for TURN servers in embedded mode and make calls mostly work
* Don't put unclonable objects into VoIP events
RoomWidget clients were unable to send m.call.candidate events, because
the candidate objects were not clonable for use with postMessage.
Converting such objects to their canonical JSON form before attempting
to send them over the wire solves this.
* Fix types
* Fix more types
* Fix lint
* Upgrade matrix-widget-api
* Save lockfile
* Untangle dependencies to fix tests
* Add some preliminary tests
* Fix tests
* Fix indirect export
* Add more tests
* Resolve TODOs
* Add queueToDevice to RoomWidgetClient
