Tracking: Define a architectural style and convert features

[xunafay]

The goal is to move away from dependency injection library and utilize bloc providers & repository providers

• [ ] #35
• [x] #13
• [ ] Accounts Architecture
• [ ] Transactions Architecture
• [ ] Category Architecture
• [ ] more to come

No more than one refactor at a time so refactors can integrate nicely with what has already been refactored