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

Patchset: 13
http://review.cyanogenmod.org/#/c/53358/
MediaScanner behavior on boot (1/3)

Lets you enable/disable/ask (with a notification) media scanning on boot.
Can speed up boot and reduce initial boot lag from MediaScanner

Change-Id: I634ae96b1dcb493b966b4653589cd97523b63da7