Add new functionality for image rectification and depth metadata handling

- Implemented a preview tool for rectifying images with interactive aspect controls in `preview.py`.
- Added tests for depth metadata loading to ensure consistent schema usage in `test_depth_metadata.py`.
- Developed comprehensive tests for cutout calibration processes in `test_cutout_calibration.py`, including stability checks and depth calibration.
- Created tests for frame compositing operations in `test_frame_compositing.py`, ensuring correct handling of depth and transparency.
- Introduced material slot inheritance functionality in `material_slots.py` to manage geometry material assignments.
- Built shared shader nodes for material processing in `shader.py`, including roughness and bump mapping setups.

tests/support/image_texture.py

@@ -35,11 +35,11 @@ def texture_context(node, **space_options):
                    edit_tree=node.id_data, id=bpy.data.materials["Texture material"], **space_options),
         ),
         object=None,
-        scene=SimpleNamespace(anyimage_settings=SimpleNamespace(video_frames=16)),
+        scene=SimpleNamespace(anyimage_settings=SimpleNamespace()),
     )
 
 
-def write_result(directory, prefix="image.", count=1):
-    for index in range(1, count + 1):
-        Image.new("RGBA", (8, 6), (128, 64, 32, 80)).save(directory / f"{prefix}{index:04d}.png")
-
+def write_result(directory, filename="foreground.png"):
+    path = directory / filename
+    Image.new("RGBA", (8, 6), (128, 64, 32, 80)).save(path)
+    return path