Advanced Asset import Editor

To facilitate asset re-import, there should be a visual user interface to help importing assets.  Many assets require additional tweaks be made on import to make them usable.  For example STL files only provide geometry data, but no material, or FBX files generally do no provide PBR materials, even if they bundle PBR textures (metal/roughness, specular/glossy).  This tool should allow the user importing assets to see what their imported scene looks like, and to make changes to the properties in the scene.  These changes can be stored in metadata so that the next time the file is imported, we can try and re-import the changes.