Themes: Use first asset entry for lockscreen wallpaper

The current implementation assumes the wallpaper will be named
either wallpaper.png or wallpaper.jpg.  If this is not the case
the wallpaper is not applied.  This patch implements the lockscreen
wallpaper the same way that the regular wallpaper is done.

Change-Id: I9f3dd299c1e61158fa53c163f7e42e21e2f9b1dc
HOVER: Don't process and/or show foreground app notifications

- Don't show notification of foreground app
- Animate the ticker in this case so user can see it

Inspired from changes linked here https://gerrit.paranoidandroid.co/#/c/4453/10

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I9f45e1641a7478c7e460c32133db00bd67f63e75

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/notification/Hover.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
Themes: Use default_wallpaper for HOLO lockscreen wp

Change-Id: I9c7fd29c99d13e811993eb9b3b045010431ccad0