Improve app list for limited users

Show all activities in the same package with a master/slave relationship,
toggling all when the master is toggled.
Don't show required apps that have no restrictions.
Show apps that are only installed on the target user.

Bug: 8520813 lowercase app names
Bug: 8520185 apps installed only in limited user
Bug: 8567000 strange behavior with apps that have two launcher icons
Change-Id: Id8ab296c13202735a9534f918bd81ea4b4c14b46