Launcher3: implement hidden & protected apps

Co-authored-by: Bruno Martins <bgcngm@gmail.com>
Co-authored-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Co-authored-by: programminghoch10 <hoch10@kabelbw.de>
Change-Id: I10c35407820373a1d5f84b237ac449398e076dcd