Evaluate Warnings and get rid of them

[wilhelmberg]

We should do another sweep through the warnings and check if something's wrong or if they are just leftovers (eg unused variables).

It's easy to miss important ones when the console if filled with a lot of unnecessary noise:

[Alexphauge]

Funny, we just upgraded to 2017 and got your latest develop branch into our project. The first thing that sprung into my eyes was 17 warnings about obsolete code calls through UnityWebRequest or unused variables.

I was just about to post about it, but then saw this post 👍