feat: Implement depth cutout symmetry and associated functionalities

- Introduced a new proposal for depth cutout symmetry, allowing for the reuse of depth replacement and geometry operations.
- Added requirements for maintaining default thickness values for cutout nodes and ensuring proper initialization during object creation.
- Enhanced symmetry node to handle existing geometry, including alignment, mirroring, and boundary filling.
- Implemented fill smoothing to control the geometry of generated walls while preserving original surfaces.
- Created tests to validate the functionality of the new symmetry features against baseline geometry.
- Updated existing assets and node groups to support the new symmetry capabilities without introducing additional dependencies.

tools/nodes/build.py

@@ -9,7 +9,7 @@ from .groups.image_depth_plane import build_image_depth_plane_group
 from .groups.image_relief_plane import build_image_relief_plane_group
 from .groups.image_cutout import build_image_cutout_group
 from .groups.image_depth_cutout import build_image_depth_cutout_group
-from .groups.image_depth_symmetry import build_image_depth_symmetry_group
+from .groups.image_cutout_symmetry import build_image_cutout_symmetry_group
 from .groups.image_layer import build_image_layer_group
 from .groups.image_depth_layer import build_image_depth_layer_group
 from .groups.shadeless import build_shadeless_group
@@ -29,7 +29,7 @@ def build_node_groups():
         build_image_relief_plane_group(image_plane),
         build_image_cutout_group(),
         build_image_depth_cutout_group(),
-        build_image_depth_symmetry_group(),
+        build_image_cutout_symmetry_group(),
         build_image_layer_group(),
         build_image_depth_layer_group(),
         build_shadeless_group(),