More query-able properties of bounding boxes

[JacobSmall]

Currently we are only able to query the min and max point of bounding boxes. Additional nodes like centroid, diagonal length, (distance between min and max point and useful for getting the generalized size of items), width, length and height should be attainable as well. Most of these are already available in "Solid" or even "Cubiod" (which can be directly created from the BB) so there are work-around methods, but those add additional complexity which would best be avoided in many cases of large data sets.