Ability to define 2 ground control points from Editor

[kfarr]

As a user creating a 3DStreet scene with a real-world longitude and latitude centerpoint, I wish to view this scene aligned in a real world location using AR mobile mode by using ground control points. Therefore I need the ability to set the location of the 2 ground control points in the Editor application that have each start and end points, nearly identical to the current function of the measure line (ruler) tool. These points are then saved as part of the scene and can be used by a user in mobile AR application Bollard Buddy to align the scene in the real world as part of #1259 .