Determine standard model scheme

[michplunkett]

What issue are you seeing?

We are currently split between two model paradigms and it makes things a bit confusing when updating and creating new models. We have some models (specifically Incidents) that are based off of the ModelView object: https://github.com/lucyparsons/OpenOversight/blob/6c08a17b042abd09a3a3ea252a1ec4ca48fecf74/OpenOversight/app/main/model_view.py#L14-L22

We then have some (Departments, Officers, etc.) that are dealt with through the use of routes: https://github.com/lucyparsons/OpenOversight/blob/6c08a17b042abd09a3a3ea252a1ec4ca48fecf74/OpenOversight/app/main/views.py#L323-L361

Trying to work in both paradigms is a bit difficult and adds a lot of confusion to the general development process. If we could move to one or the other, that'd be ideal.

cc: @abandoned-prototype @AetherUnbound @sea-kelp @dismantl