Adding mediaWarnings and 3D model bounding box information

Media objects in the Admin API now includes mediaWarnings which returns information about a media item that might require attention such as when a 3D Model is incorrectly scaled. Data about the warning can be retrieved using the associated MediaWarningCode and message string.

Model3d objects now include a new field boundingBox that returns a Model3dBoundingBox object. The bounding box of the 3D model is the size of the model described by a box that surrounds the model.