fix bad armature merging issues

also merge all bones isn't needed. we should do that by default

This also now uses dictionary matching to find bone types like hips, spine, and chest that should be merged.

Deletes bone shared and merges armatures, and parents bones back, causing a seamless merge.

core/properties.py

@@ -455,12 +455,6 @@ class AvatarToolkitSceneProperties(PropertyGroup):
         default=""
     )
 
-    merge_all_bones: BoolProperty(
-        name=t('MergeArmature.merge_all'),
-        description=t('MergeArmature.merge_all_desc'),
-        default=True
-    )
-
     apply_transforms: BoolProperty(
         name=t('MergeArmature.apply_transforms'),
         description=t('MergeArmature.apply_transforms_desc'),
@@ -529,7 +523,10 @@ def register() -> None:
     """Register the Avatar Toolkit property group"""
     logger.info("Registering Avatar Toolkit properties")
     try:
+        bpy.utils.register_class(ZeroWeightBoneItem)
         bpy.utils.register_class(AvatarToolkitSceneProperties)
+        
+        
     except ValueError:
         # Class already registered, we can continue
         pass
@@ -544,7 +541,9 @@ def unregister() -> None:
     except:
         pass
     try:
+        bpy.utils.unregister_class(ZeroWeightBoneItem)
         bpy.utils.unregister_class(AvatarToolkitSceneProperties)
+        
     except RuntimeError:
         pass
     logger.debug("Properties unregistered successfully")