cc icon, first round cc ui changes

bigbluebutton-html5/client/stylesheets/bbb-icons.css

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

.../imports/ui/components/actions-bar/captions/component.jsx

.../ui/components/user-list/captions-list-item/component.jsx

...onents/user-list/user-list-content/user-notes/styles.scss

bigbluebutton-html5/private/locales/en.json

bigbluebutton-html5/public/fonts/BbbIcons/bbb-icons.woff