[feature] URDF editor should have setting to offset height

[polyhobbyist]

what is needed
A "height above world" setting, which centers the camera above the origin.

why is it needed
The World origin is at the center of the screen. However, if you have a tall robot, you constantly have to shift it into view. Having an "offset height" setting, would allow the camera center to be more toward the middle of the robot - depending on the height