Storage wizard screens now have updated assets from UX, and various
assets are tinted consistently. We're using our own navigation bar
and wholesale replacing the layout from upstream.
Fix text colors in night mode. Tell SystemUI when we're finished
with the wizard flow.
Bug: 21830731
Change-Id: Ic8d09cc152bfb4dcc6089b5c61d28cbdd4be3ee9
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
