Notifications graphical changes:
* The body layout sets a 0 spacing, so there is a small amount of space between icon, message and buttons.
* The preferred width of the message label is 0, so it can still grow to a reasonable size and still be usable.
* The bigIconRect() was uniting the two rects (small icon and big icon), thus making long titles to overlap with the big icon itself. Big icon now is in its place.