Migration of XAML build definitions to TFS 2017

The affected projects are maintained since many years by a PTA project team in a TFS environment owned by the customer. For each project some number of build definitions exist for daily build, continuous integration builds, gated check-in builds, test builds, release builds, or various specialized builds. These build definitions were initially developed for use with TFS 2012 and are based on a XAML build platform provided to a large number of projects by an infrastructure project of the customer. TFS 2017 is the last version of TFS which supports these existing build definitions. The customer intends to update to TFS 2018 for the foreseeable future.