Fixed focusing order for the notification panel and QS

Also fixed multiple bugs regarding focusability, where
some elements were focusable even though invisible.
The buttons, QS-tiles, QS-detail buttons, QS Header
icons and other elements now have the correct focusability
state.
The rect indicating accessibility focus is now also
correct for dual label tiles, instead of just the whole
button.
Also fixes an ordering issue where notifications were above
the camera circle when launching.
In addition the focus order of the notifications now work
correctly.

Bug: 15569922
Bug: 15682123
Bug: 17159249
Bug: 15690386
Change-Id: Ie9f7ae73397b41ce2e9a4060699301fdef3a0d01