Merge pull request #8292 from KDSBrowne/who-is-talking

.../imports/api/voice-users/server/modifiers/addVoiceUser.js

...ports/api/voice-users/server/modifiers/updateVoiceUser.js

bigbluebutton-html5/imports/ui/components/app/component.jsx

bigbluebutton-html5/imports/ui/components/app/styles.scss

...ebutton-html5/imports/ui/components/nav-bar/component.jsx

...luebutton-html5/imports/ui/components/nav-bar/styles.scss

...rts/ui/components/nav-bar/talking-indicator/component.jsx

...rts/ui/components/nav-bar/talking-indicator/container.jsx

...mports/ui/components/nav-bar/talking-indicator/service.js

...ports/ui/components/nav-bar/talking-indicator/styles.scss

bigbluebutton-html5/private/config/settings.yml