Switching environments, data sources, and other dynamically changeable settings in TFS Lab (on-premise) for 2013

Thanks to a post on this blog, we can access the settings inject into Lab-managed builds in TFS 2012 and 2013. Even though this is 2016 and many people are moving to the cloud with VSTS, there are still a good number of companies out there with considerable infrastructure "on-premise", and TFS can help with executing automated tests in those environments. I'm going to be building a library for helping others out with retrieving settings dynamically from TFS and I'll update my blog when it's available.