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.

tests/tools/nodes/test_saved_layout.py

@@ -25,11 +25,11 @@ class NodeAssetsTest(unittest.TestCase):
         self.assertEqual(len(groups), 7)
         for group in groups:
             validate_node_structure(group)
-            positions = {node.name: tuple(node.location) for node in group.nodes
+            positions = {node.name: tuple(node.location_absolute) for node in group.nodes
                          if node.bl_idname not in {"NodeReroute", "NodeGroupInput"}}
             arrange_nodes(group)
             for name, position in positions.items():
-                for actual, expected in zip(group.nodes[name].location, position):
+                for actual, expected in zip(group.nodes[name].location_absolute, position):
                     self.assertAlmostEqual(actual, expected, delta=0.01, msg=f"{group.name}: {name}")