Merge pull request #4209 from Klauswk/html5-toggle-mute

...utton-html5/imports/api/2.0/voice-users/server/methods.js

.../imports/api/2.0/voice-users/server/methods/muteToggle.js

...ports/ui/components/actions-bar/mute-button/container.jsx

...utton-html5/imports/ui/components/user-list/component.jsx

bigbluebutton-html5/private/config/public/acl.yaml