IPv4 FS audio fallback, auto-reconnect, and fixed input select

bigbluebutton-html5/imports/api/audio/client/bridge/base.js

bigbluebutton-html5/imports/api/audio/client/bridge/sip.js

...html5/imports/ui/components/audio/audio-modal/styles.scss

...luebutton-html5/imports/ui/components/audio/container.jsx

...uebutton-html5/imports/ui/services/audio-manager/index.js

bigbluebutton-html5/private/config/settings.yml

bigbluebutton-html5/private/locales/en.json

bigbluebutton-html5/public/resources/sounds/LeftCall.mp3