Stack based mode management testing.
Watch state management cleanup, organization, simplification, and
improvement. Improved disconnect and exit.
Minor cleanup and missing break bug in switch statement.
Improved, consolidated, and simplified mode management, specifically end
mode functionality. See: NavigationManagement class. Work on call screen
button features.
Minor tweaks to watch mode management. Active bluetooth enabled state
management, request to turn on bluetooth if disabled.
Import cleanup.
Fixed shutdownRequested flag.