Reenable touches to notifications in expanded QS

Revert "Closing the QS when tapping on the notifications now."
This reverts commit 3bb0bb8817690728a40edd3f8f665b09907a451b.

Revert "Disabled touch interaction when in Quick settings."
This reverts commit 5cd19bc6a4fac0513bb285fdaf08b1d19c87f4ae.

Also, shuffle order of notifications and quick settings such that
scrolling still works and delegate touches from stack scroller to
the scroll view for expanded QS panel.

In addition, make the panel close transition work when QS is expanded
and scrolled.

Last but not least, decrease scrim amount so the notifications still
look 100% interactive.

Change-Id: I17710e078cff84bcdf303c22986a31135dae2aee