Webrtc client side (#4026)

* WebRTC Server side

* WebRTC client side

* Bug fixes and improvements

* Pushing UI improvements for webrtc (#3728)

* Pushing UI improvements for webrtc

* Updating webrtc css

* PLT-3943 WebRTC P1: bug fixes and improvements

* Video resolution set to std, reduce volume of ringtone and flip video horizontally

* Fix calling a user B while WebRTC RHS is still opened

* Leave RHS opened when call ends, Fix isBusy on popover and channel_header

* Fix pre-release feature, RHS & System Console

* PLT-3945 - Updating UI for webrtc (#3908)

* PLT-3943 Webrtc p1

* Add ongoing call indicator when RHS is opened

* UI updates to to webrtc notifcation (#3959)

webapp/components/admin_console/admin_sidebar.jsx

@@ -264,7 +264,7 @@ export default class AdminSidebar extends React.Component {
                         title={
                             <FormattedMessage
                                 id='admin.sidebar.webrtc'
-                                defaultMessage='WebRTC'
+                                defaultMessage='WebRTC (Beta)'
                             />
                         }
                     />