Add world-coordinate scale bar to Studio (#2259)#2601
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Add a 'Show scale bar' toggle (in the surface/isosurface popup menu, next to the bounding-box toggle) that draws a vtkCubeAxesActor: labeled tick marks in world (physical) units along the edges of the shape's bounding box. Unlike a 2D legend scale bar, ruled axes read correctly in a perspective view. The bounds are shared with the bounding-box computation and the setting persists via Preferences.
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Adds a "Show scale bar" option to Studio that overlays a labeled world-coordinate ruler around the shape, so the physical size of the data is readable directly in the 3D view.
Fixes #2259