Update Unity app from Unity 2017 to the most current Unity version.

This well constrained project involves porting an iPhone app developed using the Unity 2017 IDE, ARKit, Mapbox and C# to the current version of the above listed SDK's and the latest version of the Unity IDE. The deliverable is the project building clean in the clients copy of the Unity IDE. It is anticipated the project will require less than 15 hours of effort by a competent Unity developer with mid-level ARKit, Mapbox and c# experience.