feat: Add new Geometry Nodes groups for image relief and shadeless shader

- Implemented the "O Image Relief Plane" Geometry Nodes group to create a fixed-base image relief using depth images and various parameters.
- Created the "O Shadeless" shader node group to display color without scene lighting while preserving shadows and reflections.
- Introduced a preview feature for node groups, allowing for interactive visualization of node arrangements in an HTML format.
- Added a template HTML file for rendering node previews with customizable views and controls.

tests/test_tool_commands.py

@@ -15,8 +15,8 @@ class ToolCommandsTests(unittest.TestCase):
             project["scripts"],
             {
                 "pack": "tools.pack:main",
-                "build_node": "tools.build_node:main",
-                "sync_models": "tools.sync_models:main",
+                "build_node": "tools.nodes.cli:main",
+                "sync_models": "tools.models.cli:main",
                 "docs": "tools.docs:main",
             },
         )