[WIP] Roadways.jl rendering

[MaximeBouton]

• implement rendering for Roadways.jl map representation using the renderable interface
• comment out all the code that was specific to AutomotiveDrivingModels.

I would say that when Roadways.jl and friends are ready AutoViz should not depend on AutomotiveDrivingModels.jl and the commented code should eventually be removed.

Here is a list of things that I think we want to keep from the current AutoViz:

• camera stuff
• low level rendering functions (from rendermodels.jl)
• arrow cars
• overlays: the current overlays are depending on AutomotiveDrivingModels and the scene representation. I found them really useful when using the old AutoViz interface and would be in favor of having a similar concept of overlays for Roadways.jl and the renderable interface.