Add a System App Remover in to Settings

ported from slimroms
original author: fronti90
contributers: kufikugel, mnm9994u, corcoran
to do: change the name, please suggest something.
A better place in settings--> done
fix fc--> done

PS2: fix force close
PS3: put it under interface/more
Change-Id: I3de35e34e47f99132b7c64734f65d2a25f9c62c6