Revert Lockscreen Transprancy

Change-Id: Ic125b8b610b4b2db969455be068e5e4afebc289d
Revert "Port CM LockScreen (1/2)"

This reverts commit 3d1b42c07a8ae64157f982addffd463571420cf2.

Conflicts:
	core/java/android/provider/Settings.java

Change-Id: I1ba625932b92a25d347ff1bc4eb6765d9b850cd1
Frameworks: customizable slim lockscreen background (1/2)

- color fill (with transparency slider)
- custom image (with transparency slider)
- full transparent
- default

Conflicts:
	core/java/android/provider/Settings.java
	policy/src/com/android/internal/policy/impl/keyguard/KeyguardViewManager.java
	services/java/com/android/server/wm/WindowAnimator.java

Change-Id: Ie3d03038e74e7fc5dffb769ee808212c8fa920da
Frameworks: simplify custom lockscreen background code

- remove observer for transparency and handle it better
- add multisuser handles
- smaller fixes and code cleanup
- simpfliy custom background handling and change to our needs (thanks Danish)

Change-Id: I1592d1b4d2e2deec076fc5e1d2d3798b74534bd8