fb: notification transparency (1/2)

this add back notification transparency...compared to 4.3
it controlls as well the notification icon backgound transparency
which felt in the past dissplaced. As well codecleanup of the old
implementation.

largeIcon support I did not add due that google does not support it
as well at current status...it is only a placeholder in
NotificationData

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

Change-Id: Ic5bb8998f64cac573d70005fad909104accc9e96
Camera Key description

Change-Id: Ic9a22448c16428fc2f311ea813aa2ec5f27493db
Missing break in switch statement

Change-Id: I462c0c5fec96a850032266b04419ec409ad02174