add panel manager component

bigbluebutton-html5/client/main.jsx

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

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

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

...tton-html5/imports/ui/components/breakout-room/service.js

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

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

...n-html5/imports/ui/components/panel-manager/component.jsx

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

...tml5/imports/ui/components/poll/live-result/component.jsx

...orts/ui/components/user-list/chat-list-item/component.jsx

...s/user-list/user-list-content/breakout-room/component.jsx

...r-participants/user-list-item/user-dropdown/component.jsx

...ents/user-list/user-list-content/user-polls/component.jsx