settings: Add xxhdpi profile icon

Change-Id: Ib4b45821fc7b908a8fe5d44f31543c5e7e15ba5a
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
New setting under "Debug settings" that enables the development shortcut

Resolve Conflicts:
	res/values/cm_strings.xml
	src/com/android/settings/DevelopmentSettings.java

Change-Id: I9a43e611911f2e278605715f714860ad11236fd9