full rebase to cm's Lockscreen wallpaper

picked from:

   https://github.com/CyanogenMod/android_frameworks_base/commit/032650221f8f164b4c5f43d8488e569294faa0fc
   https://github.com/CyanogenMod/android_frameworks_base/commit/28070f9e0b9ef5b43e2a9c2196c5d7c3226100ee
   https://github.com/CyanogenMod/android_frameworks_base/commit/ec4fb56444ae2b6a846f829730a6e07ccfd5ccc0
   https://github.com/CyanogenMod/android_frameworks_base/commit/7bd5eaa5dd5d8cbed1cb7b6563176bc034d8a9f4

Change-Id: I39bcc08d39eeeda78474ba7a6d828690bb66b342

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
Lockscreen wallpaper for themes

Change-Id: If77b97301c5bfebd94b193fe9a54e676e678d3ed
Add android_system_label to symbols.xml

Change-Id: Id5ae4f440becb5039b189ea59a5c459178550e46
frameworks: move keyguard wallpaper to system  (1/2)

Change-Id: I0eb1b5578b705c2ade4c0772fa86e09478b9f73e
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/gummy_strings.xml
	services/java/com/android/server/WallpaperManagerService.java