Deleted the DTOs, no longer feel it's a good design decision for our app... implemented some functionality for question repository stuff...

and tried to get the UI to communicate with it.
Solved a lot of merge conflicts!

Conflicts:
	TriviaGame/Domain/Persistence/IGameRepository.cs
	TriviaGame/Domain/Services/AnswerServices.cs
	TriviaGame/Domain/Services/CategoryServices.cs
	TriviaGame/UI/Pages/GameSelectionPage.xaml.cs
	TriviaGame/UI/Pages/QuestionPage.xaml.cs