* feat(conference) Impl audio/video mute disable when sender limit is reached.
Jicofo sends a presence when the audio/video sender limit is reached in the conference. The client can then proceed to disable the audio and video mute buttons when this occurs.
* squash: use a different action type and show notification.
* Moves talk while muted as a new feature.
* Adds sound notification for talk while muted.
* Reorder imports and changes the dispatch of the notification.
* Introduces sounds.js for talk while muted.