Add new tests and functionality for image processing and geometry handling

- Introduced color_image.py for preparing standalone color images for tests.
- Added hdr_image.py to create HDR textures for testing.
- Implemented test_image_depth_panorama.py to evaluate panorama topology, UVs, and depth discontinuities.
- Created test_shadeless.py to validate the opacity and HDR color endpoints of the Shadeless group.
- Developed moge3_export.py for exporting dynamic MoGe-3 backbone and ONNX graphs.
- Added material.py to inherit material slots onto generated geometry.
- Built image_depth_panorama.py to construct a quad panorama with depth separation and sampling.

tools/nodes/common/material.py

@@ -0,0 +1,22 @@
+"""Carry the input mesh's material slots onto generated geometry."""
+
+
+def inherit_material_slots(group, geometry, source):
+    nodes, links = group.nodes, group.links
+    capture = nodes.new("GeometryNodeCaptureAttribute")
+    capture.domain = "POINT"
+    capture.capture_items.clear()
+    capture.capture_items.new("BOOLEAN", "Source")
+    capture.inputs["Source"].default_value = True
+    links.new(source, capture.inputs["Geometry"])
+    join = nodes.new("GeometryNodeJoinGeometry")
+    links.new(geometry, join.inputs["Geometry"])
+    links.new(capture.outputs["Geometry"], join.inputs["Geometry"])
+    material = nodes.new("GeometryNodeSetMaterialIndex")
+    material.inputs["Material Index"].default_value = 0
+    links.new(join.outputs["Geometry"], material.inputs["Geometry"])
+    delete = nodes.new("GeometryNodeDeleteGeometry")
+    delete.domain = "POINT"
+    links.new(material.outputs["Geometry"], delete.inputs["Geometry"])
+    links.new(capture.outputs["Source"], delete.inputs["Selection"])
+    return delete.outputs["Geometry"]