ICS updates to notification layouts.

Of note:

1. There is no "X" (veto) button anymore. (Well, there is,
   but it's offscreen so it should still be available to
   assistive devices.) Users can use "Clear all" or the new
   swipe-to-veto gesture to clear notifications.

2. As a consequence of #1, your layout goes all the way to
   the right edge of the notifications panel again. Enjoy
   the extra space!

3. The numeric bubble in the notification icon is now capped
   at "999+" like it is in the expanded notification view.
   (Note that this involves a couple of new public framework
   resources: one to indicate the number beyond which the
   substitution string will be used, and one specifying a
   localizable substitution string.)

Bug: 4651514
Bug: 4686329
Bug: 4501990
Change-Id: I0e6bdb6aec4fe5bfc927eb1aba955d444a9414ec