Mute meeting functionality implemented

...ton-html5/imports/api/voice-users/server/eventHandlers.js

...5/imports/api/voice-users/server/handlers/meetingMuted.js

...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

...rts/api/voice-users/server/modifiers/changeMuteMeeting.js

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

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

...uebutton-html5/imports/ui/components/user-list/service.js

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

...er-list/user-list-content/user-participants/component.jsx

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

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

bigbluebutton-html5/private/config/settings-development.json

bigbluebutton-html5/private/config/settings-production.json

bigbluebutton-html5/private/locales/en.json