Implemented recording timer

...button-html5/imports/api/meetings/server/eventHandlers.js

...orts/api/meetings/server/handlers/recordingTimerChange.js

.../ui/components/actions-bar/actions-dropdown/component.jsx

...ton-html5/imports/ui/components/actions-bar/container.jsx

...button-html5/imports/ui/components/actions-bar/service.js

...ebutton-html5/imports/ui/components/nav-bar/component.jsx

...ebutton-html5/imports/ui/components/nav-bar/container.jsx

...s/ui/components/nav-bar/recording-indicator/component.jsx

...rts/ui/components/nav-bar/recording-indicator/styles.scss

bigbluebutton-html5/imports/ui/components/nav-bar/service.js

...utton-html5/imports/ui/components/recording/component.jsx

...utton-html5/imports/ui/components/recording/container.jsx

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

bigbluebutton-html5/private/config/settings.yml