Use frameworks/opt/setupwizard/library/ for consistent behavior and
styling on phones and tablets. Implement every step of wizard flow
and connect them together, even though some steps are currently
non-functional. All strings to match UX spec, with some adjustment.
Wizards inherit from helper base class.
New interstitials before unmounting or formatting private storage
to confirm user knows consequences.
Bug: 19993667
Change-Id: I2c774e1718d513805ee8aecfc96d066d4730450c
