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/anyimage/server/support.py

@@ -1,7 +1,6 @@
 from tests.support.paths import PROJECT_ROOT
 import sys
 from pathlib import Path
-from types import SimpleNamespace
 
 
 def load_server_module(name):
@@ -13,49 +12,6 @@ def load_server_module(name):
         sys.path.remove(str(addon_directory))
 
 
-def _make_fake_av(frame_count):
-    """Build a fake av module yielding frame_count integer-valued frames."""
-    class FakeImage:
-        def __init__(self, value):
-            self.value = value
-
-        def save(self, path, format=None):
-            Path(path).write_text(str(self.value), encoding="utf-8")
-
-    class FakeFrame:
-        def __init__(self, value):
-            self.value = value
-
-        def to_image(self):
-            return FakeImage(self.value)
-
-    class FakeContainer:
-        def __init__(self):
-            self.position = 0
-            self.closed = False
-            self.streams = SimpleNamespace(video=[object()])
-
-        def decode(self, _stream):
-            while self.position < frame_count:
-                frame = FakeFrame(self.position)
-                self.position += 1
-                yield frame
-
-        def close(self):
-            self.closed = True
-
-    class FakeAv:
-        def __init__(self):
-            self.containers = []
-
-        def open(self, _path):
-            container = FakeContainer()
-            self.containers.append(container)
-            return container
-
-    return FakeAv()
-
-
 class FakeModels:
     def __init__(self, directory="BEN2-ONNX"):
         self.model_directory = Path(directory)