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.

ui/custom_avatar_panel.py

@@ -155,7 +155,6 @@ class AvatarToolKit_PT_CustomPanel(Panel):
         
         # Group related options together
         transform_col: UILayout = col.column(align=True)
-        transform_col.prop(toolkit, "merge_all_bones")
         transform_col.prop(toolkit, "apply_transforms")
         
         col.separator(factor=0.5)