Major:
- move SetupWizard-related codes to WifiSettingsForSetupWizardXL as
much as possible
- stop using Preference for configurinig wifi network. We use
WifiConfigUiForSetupWizardXL instead, which is base on a bare View.
Minor:
- change button handling code expecting better readability.
- hide Detail button.
- modify strings a bit.
- add logs
Bug: 3175016
Change-Id: I5b29917af73aac6a82e13ba846a9d5085f9bd523
