* Remove ClientReady and WidgetReady hacks from the Jitsi wrapper
By registering widget API listeners earlier and simply blocking the
execution of all actions until the Jitsi wrapper has finished setting
up, sending a WidgetReady action becomes no longer necessary.
The ClientReady action is likewise not necessary, because in practice
getting a ready event means the client and the widget have already been
happily talking back and forth for capability negotiation.
* Rename audioDevice/videoDevice to audioInput/videoInput
* Combine HangupCall and ForceHangupCall into one action
* Apply misc code review suggestions
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