Refactor geometry generation to standardize Blender object coordinates

- Unified the canonical local frame for generated geometries (Plane, Depth Plane, Relief Plane, Cutout, Depth Cutout) to align with Blender's object coordinate system, setting X as horizontal, Z as up, and +Y as depth.
- Removed the `Depth Axis` parameter from `O Image Cutout` and `O Image Depth Cutout`, simplifying the geometry generation process.
- Updated the depth direction defaults to use +Y instead of -Z for `O Image Relief Plane` and Depth Symmetry.
- Adjusted the geometry nodes to ensure thickness, projection, and shell displacements operate along the Y-axis.
- Implemented new capabilities for handling object space normals to align with the new canonical frame.
- Enhanced the Depth Symmetry functionality to mirror across the canonical Y-axis and perform a final rotation to maintain the correct orientation.
- Added tests to validate the new coordinate system and ensure compatibility with existing assets.

tests/tools/nodes/test_cutout_boundary.py

@@ -67,7 +67,7 @@ def test_split_profile_tapers_within_boundary_band(resolution, aspect):
     set_value("Depth Split", .1)
     points, faces = evaluated(obj)
     boundary = boundary_neighbors(faces)
-    cut = [i for i in boundary if 0 < points[i,1] < 1 and .5*aspect < points[i,0] < 1.5*aspect]
+    cut = [i for i in boundary if 0 < points[i,2] < 1 and .5*aspect < points[i,0] < 1.5*aspect]
     assert cut
     band = edge_band(faces, cut)
     outside = [i for i in range(len(points)) if i not in band]