WindowManager: Upper level changes to expose blur effect

Upper level changes to expose blur-behind and blur-mask effect

Change-Id: I6d37b43888c8c5e028974bd714596d8178cb5114

WindowManager: Adding template for BlurLayer file

Cyanogen changes:
  * Use config.xml instead of settings
  * Don't break stuff if not supported in SF
  * Incremental fade for insecure lockscreen
  * Disabled extra effects for now

Change-Id: Icefe452f7a015656661e8543849c9b88889dbb40