remove Verto code

bigbluebutton-html5/client/compatibility/verto-min.js

bigbluebutton-html5/client/compatibility/verto_extension.js

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

...tton-html5/imports/api/screenshare/client/bridge/index.js

...on-html5/imports/api/screenshare/client/bridge/service.js

...tton-html5/imports/api/screenshare/client/bridge/verto.js

...button-html5/imports/ui/components/screenshare/service.js

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

bigbluebutton-html5/private/config/settings.yml