TASK-35: clean up getVehicle
TASK-35: Add support to toast while in GDX core
WIP: vehicle choise wait screen
TASK-35: fix vehicle selection
TASK-35: Code review changes
TASK-35: Main Menu fixes, more infrastructure

* Can now save/load shared prefs from GDX core
* Displayname saved to shared prefs everytime it’s modified
* Displayname loaded from shared prefs, if none it’s defaulted to BRAND + “ “ + MODEL
* No more duplicate entries
Merge pull request #55 from DanLatimer/topic/TASK-35

Topic/task 35 Add waiting screen after vehicle selection