- get rid of DescriptorNamer, always use descriptor.getName() instead
- delete AbstractClassResolver.getClassObjectName(), always use
"<class-object-for-...>", except for the case of built-ins serialization
(class object names should be replaced by "object" when writing files with
serialized data for built-ins)
- delete NestedClassResolver.resolveClassObject(), always use the other method
of this class instead