Add toast notifications

bigbluebutton-html5/client/stylesheets/toastify.css

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

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

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

bigbluebutton-html5/imports/ui/components/toast/service.jsx

bigbluebutton-html5/imports/ui/components/toast/styles.scss

bigbluebutton-html5/imports/ui/services/api/index.js

...luebutton-html5/imports/ui/services/notification/index.js

...5/imports/ui/services/notification/notificationService.js

...utton-html5/imports/ui/stylesheets/variables/palette.scss

bigbluebutton-html5/package.json