Settings: notification drawer background & transparency

    so after keyguard is mostly done let us start notification drawer
    and QS. First one custom background.....either color or picture
    with custom alpha and ability to set a landscape picture seperatly
     if the user want. (lanscape phone only)

    Compared to the 4.3 included version completly recoded and better
    integrated. No idea what I thought 1 year ago on the old implementation

    cheeers

Change-Id: I23f4502e3d9e97f52245bbf3b41900939bb5c4ce

Conflicts:
	res/values/slim_arrays.xml
	res/values/slim_strings.xml
	res/xml/notification_drawer_settings.xml
	src/com/android/settings/widget/SeekBarPreference.java

settings: notification transparency (2/2)

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

Change-Id: Iacefd9d02919990517823e5d800c6e018c3c68a1

Conflicts:
	res/values/slim_strings.xml
	res/xml/notification_bg_pref.xml
	src/com/android/settings/AOSPAL/NotificationDrawerQsSettings.java