First pass on view animation helper class and sample

[kevinzak]

Ben and I added some FadeIn and FadeOut methods and created a base structure. We wanted to have a further conversation about naming and where the animation helper classes should live.

[benjaminbojko]

I think this is a great start. As discussed, a few questions we should resolve before merging this in:

• Namespace + folder (high priority): The class currently lives in src/utils, but that is confusing with the bluecadet::utils namespace
• Class name (low priority): We both mentioned that ViewAnimations might not be the best fit. Can we come up with something more fitting?

Aside from these two I'd say it would be good to merge in, @kevinzak.