Q&A Module Rework

The Q&A Module needs to be reworked. The new UI is already relatively polished and implemented(aside from UserStories yet to come), but the Blocs and "repository" are a mess.

Things we need to take a look at:

• BLoC Rework
  • QuestionBloc
    • Implement proper state classes
    • Build UI based on state (instead of providing Widgets from the BLoC)
  • AnswerBloc
  • HelpfulBloc
  • CategoryBloc
• UI-Rework
  • QuestionPage
  • QuestionWidget (there are currently UpdatedQuestionWidgets and the old QuestionWidget in use)
  • AnswerWidget (there are currently UpdatedAnswerWidgets and the old AnswerWidget in use)
  • HelpfulWidget
• Model Rework
  • Hearts, Likes and Helpfuls
  • Add Equatable to all relevant classes
  • Add automated JSON-Serialization to relevant classes

@tmch74 @clep09 @mblt41 @mlbn33 @rapl42 @jsar97

This is a bigger issue, and might take a while. I would invite all of you to give some input sooner or later, also feel free to expand the list of necessary updates if you find any. As you see not much progress has been made yet, so a lot of things are subject to change! If I run into any complications with your previous code i will find you and i will debug you!

Relates to the !237 (merged) MR