Refactor Modal related components

...luebutton-html5/imports/ui/components/about/component.jsx

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

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

bigbluebutton-html5/imports/ui/components/app/component.jsx

bigbluebutton-html5/imports/ui/components/app/container.jsx

bigbluebutton-html5/imports/ui/components/app/service.js

...mports/ui/components/audio-modal/join-audio/component.jsx

bigbluebutton-html5/imports/ui/components/chat/container.jsx

...tton-html5/imports/ui/components/modal/base/component.jsx

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

...tml5/imports/ui/components/modal/fullscreen/component.jsx

bigbluebutton-html5/imports/ui/components/modal/service.js

...on-html5/imports/ui/components/modal/simple/component.jsx

...tton-html5/imports/ui/components/modal/simple/styles.scss

...rts/ui/components/nav-bar/settings-dropdown/component.jsx