Adds popout component & basic popout functionality

.meteor/versions

packages/rocketchat-livechat/app/package-lock.json

...ges/rocketchat-livestream/client/views/liveStreamTab.html

packages/rocketchat-livestream/client/views/liveStreamTab.js

...es/rocketchat-livestream/client/views/liveStreamView.html

...ages/rocketchat-livestream/client/views/liveStreamView.js

packages/rocketchat-livestream/package.js

...ges/rocketchat-theme/client/imports/components/popout.css

packages/rocketchat-theme/client/main.css

packages/rocketchat-ui/client/views/app/popout.html

packages/rocketchat-ui/client/views/app/popout.js

packages/rocketchat-ui/package.js