Framework : Lockscreen - Customizable shortcuts

Forward port lockscreen shortcuts

Change-Id: Ic3b935df5c0da35f31373d96943e442dc39cf11b

Conflicts:
	core/java/com/android/internal/widget/multiwaveview/GlowPadView.java
	packages/Keyguard/src/com/android/keyguard/KeyguardSelectorView.java