Some middleware functions are declared as async. This wraps next(action) in Promise which will delay the execution of actions and also dispatch will return the its result always as a Promise.

* 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.

Co-authored-by: Vlad Piersec <vlad.piersec@8x8.com>

* 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.