Squashed commits:
[d64bb3bb] Stop using the ServiceLocator directly in the ScreenTrackerViewModifier
[37c46ab9] Rename Analytics to AnalyticsService
[8852a371] #920 - Cleanup ServiceLocator usages
* Remove unused code in OnboardingScreen.
* Add FullscreenDialog layout and use in auth flow.
Bump minimum OS to 16.4/13.3.
* Add dynamic layout based on dynamic type size.