vtkGLTFDocumentLoader: Report progress when loading both meshes and images
This MR makes vtkGLTFImporter also emit progress events while the images are being read from the gltf document. Earlier, progress was reported only when loading meshes.
This MR makes vtkGLTFImporter also emit progress events while the images are being read from the gltf document. Earlier, progress was reported only when loading meshes.