power menu: reboot and screenshot

Ported from CyanogenMod 10 mr1-staging branch
https://github.com/CyanogenMod/android_frameworks_base/tree/mr1-staging
force led to pulse even if the screen has been shut off while the notification was active
Allow volumes to be unlinked.
Make the volume overlay more functinal.
Volume rocker music control

Ported from CyanogenMod mr1-staging branch
https://github.com/CyanogenMod/android_frameworks_base/tree/mr1-staging

Remove volume rocker wake completely since it doesn't work, but

don't remove music control

Signed-off-by: Paul Beeler <sparksco@gmail.com>

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