Implement arrangement framework for node groups

- Introduced `frames.py` to manage field complex calculations and their arrangement within node groups.
- Added functionality to create and remove field frames based on node arrangements.
- Developed `passages.py` to find unobstructed paths for connections around calculation frames.
- Implemented `references.py` to route shared results on peripheral tracks, ensuring efficient distribution of outputs.
- Created `sections.py` to reserve space for field calculations adjacent to geometry consumers.
- Added `sources.py` to position shared calculation sources effectively beside their distribution channels.
- Enhanced outline smoothing with `outline_smoothing.py` to adapt camera depth along original outlines.

tools/nodes/check.py

@@ -58,7 +58,8 @@ def check_asset_library(asset_path):
         modifier = obj.modifiers.new("Asset Check", "NODES")
         modifier.node_group = node_group
         values = {"Subdivide": 0, "Thickness": 0.2, "Reference Depth": 2.0,
-                  "Depth Image": depth_image, "Uniform Scale": 1.0, "Normal Smooth": 0}
+                  "Depth Image": depth_image, "Uniform Scale": 1.0, "Normal Smooth": 0,
+                  "Split Threshold": 0.0}
         for item in node_group.interface.items_tree:
             if item.item_type == "SOCKET" and item.in_out == "INPUT" and item.name in values:
                 modifier[item.identifier] = values[item.name]