Orthographic tests are in the wrong units per <asset><unit meter>

StandardDataSets\collada\library_cameras\camera\optics\orthographic and probably elsewhere have `50` which should be in centimeters to match the document's units, but are shown as if they are 50 **meters** in the reference images.

These are not angles, and technically neither are `` and `` but as long as the clipping planes don't obscure the image those are not a problem.

Start with StandardDataSets\collada\library_cameras\camera\optics\orthographic and inspect the xmag values against the document's asset unit. Search the surrounding COLLADA test data for similar orthographic values, then compare the reference images and confirm the camera measurements are expressed consistently in centimeters without clipping-plane changes obscuring the result.

Written by the indexing model from the issue text.