Add automatic target recognition to the survey tab / AT

Agisoft has an automatic target recognition feature that makes it really accurate for scaling. Instead of having to pick the centers and introduce human error it just picks the centers for you. They use some sort of circular target, but I think they will also recognize checkerboard targets. I use scale bars that are precistion printed with checkerboard targets to .5 and .25 meters. It would be super handy if ContextCapture could acquire and label them in the survey tab so that we could just add a dimension and have a scaled model. This would be handy for surveyed targets too.