3D Contours

We need to be able to increment contours down to 0.50ft and the lowest the interface will let you go is 1ft so when you get maps like this there’s no detail on the actual area of interest. We also need to figure out how to not put contours on non-DTM objects. I mean it’s cool (the signs are cooler) looking but a detriment to usability. @Adam_Carp (Yo!)