Added mute meeting settings to yml file

...luebutton-html5/imports/api/voice-users/server/methods.js

...oice-users/server/methods/muteAllExceptPresenterToggle.js

...5/imports/api/voice-users/server/methods/muteAllToggle.js

...tml5/imports/api/voice-users/server/methods/muteToggle.js

...s/ui/components/user-list/user-list-content/component.jsx

...list-content/user-participants/user-options/container.jsx

bigbluebutton-html5/private/config/settings.yml