Newish nav drawables

Change-Id: Ib7ea386284544a24b00538621cbdc172d0b7375b

Conflicts:
	packages/SystemUI/res/drawable-xhdpi/ic_sysbar_killtask.png
	packages/SystemUI/res/drawable-xhdpi/ic_sysbar_lastapp.png
	packages/SystemUI/res/drawable-xhdpi/ic_sysbar_notifications.png
	packages/SystemUI/res/drawable-xhdpi/ic_sysbar_power.png