Move topBar to it's own component

Extract TopbarLayout-topBar to it's own component named Toolbar (same name used in material angular).

https://trello.com/c/Vc6hH5xz/34-move-topbar-to-it-s-own-component
I've already explained this. The toolbar doesn't position itself. You still need the `TopBarLayout-header` to position the `Toolbar`.  The first takes care of the position and the second of the style.