feat: Add VRM Blender addon with complete import/export functionality

- Add core VRM addon infrastructure with manifest and registration
- Add common utilities module with file system, logging, and conversion helpers
- Add human bone mapper with support for multiple rigging standards (Mixamo, MMD, Unreal, Rigify, etc.)
- Add VRM 0.x and 1.x format support with property groups and handlers
- Add editor UI panels for VRM metadata, spring bones, and MToon materials
- Add exporter with glTF2 extension support for VRM format serialization
- Add importer with scene reconstruction and armature generation
- Add MToon shader support with auto-setup and material migration
- Add spring bone physics simulation with constraint handling
- Add node constraint editor for advanced rigging control
- Add comprehensive validation and error handling with user dialogs
- Add scene watcher for real-time property synchronization
- Add workspace management and preference system
- Include Python cache files and Blender manifest configuration
- This is the initial commit establishing the complete VRM addon ecosystem for Blender

common/safe_removal.py

@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: MIT OR GPL-3.0-or-later
+
+from bpy.types import Context, Object
+
+
+def remove_object(context: Context, obj: Object) -> bool:
+    for collection in [
+        *[scene.collection for scene in context.blend_data.scenes],
+        *context.blend_data.collections,
+    ]:
+        for collection_object in collection.objects:
+            if collection_object.parent != obj:
+                continue
+            if collection_object.parent_type != obj.parent_type:
+                collection_object.parent_type = obj.parent_type
+            if collection_object.parent != obj.parent:
+                collection_object.parent = obj.parent
+            if collection_object.parent_bone != obj.parent_bone:
+                collection_object.parent_bone = obj.parent_bone
+
+        if obj.name in collection.objects:
+            collection.objects.unlink(obj)
+
+    if obj.users:
+        return False
+
+    context.blend_data.objects.remove(obj, do_unlink=True)
+    return True