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/operators/test_plane_conversion.py

@@ -38,7 +38,7 @@ def test_conversion_preserves_offset_world_placement_and_initializes_inputs(surf
     modifier = result.modifiers[0]
     assert modifier[inputs["Thickness"].identifier] == 0
     assert modifier[inputs["Depth Image"].identifier] == image
-    assert modifier[inputs["Valid Only"].identifier] is True
+    assert modifier[inputs["Depth Mask"].identifier] is True
     assert modifier[inputs["Reference Depth"].identifier] == pytest.approx(
         2 * modifier[inputs["Uniform Scale"].identifier])
     assert result.data.materials[0] == material