feat: add fix material feature.

bring ballance virtools helper used fix_texture (renamed as fix material to correspond with the real object operated by this function) into blender plugin.

bbp_ng/OP_ADDS_bme.py

@@ -239,10 +239,10 @@ class BBP_OT_add_bme_struct(bpy.types.Operator):
 
 #endregion
 
-def register():
+def register() -> None:
     bpy.utils.register_class(BBP_PG_bme_adder_cfgs)
     bpy.utils.register_class(BBP_OT_add_bme_struct)
 
-def unregister():
+def unregister() -> None:
     bpy.utils.unregister_class(BBP_OT_add_bme_struct)
     bpy.utils.unregister_class(BBP_PG_bme_adder_cfgs)