Add notification banner in CM pages

Updated designs for the notification bar and the icons and messages it shows.
Banner height changed to 48 px, white circle 30px added in background of 20x20px icon

Note that the notification banner is shown always (not only for xPages)

Design images in: https://bloomreach.invisionapp.com/d/main?origin=v7#/projects/prototypes/20222730
or: https://bloomreach.invisionapp.com/share/EAXXG6QSV79 
Specs: https://docs.google.com/spreadsheets/d/1GOq_-dztjLmQ6MMpsJoEF6hg8eDFLTrlAKcQgTtLe50/edit?usp=sharing 
(icons from materialdesignicons icon font except xPage icon which is attached below)