settings: add back notification shortcuts + slim classes we need

this will add back slims notification shorcuts feature as well
we add common slim classes we use for navbar navring pie etc
see fb commit for more details

Change-Id: I798d6597a8894fa47718fa6310b7965239130a3a

Conflicts:
	res/drawable-hdpi/ic_grabber.png
	res/drawable-mdpi/ic_grabber.png
	res/drawable-xhdpi/ic_grabber.png
	res/drawable-xxhdpi/ic_grabber.png
	res/layout/buttons_list_view_main.xml
	res/values/cr_arrays.xml
	res/values/cr_strings.xml

Thanks to @temasek cherry-picked from: d96987e3637825d063e1b380fb21be47b4d1f0a2