Large refactor - rename pyserializable bitfold

Primarily, things have been renamed from serial* to fold*
Additionally, converters became translators and were merged.
  Name vs format translators are differentiated by where they are
  found in the format string.  This is a good reason to not overlap
  those values :)
Folder (previously Serializer) access is simplified, and should
primarily be done through the folder() method.  Folders are unique
by name, and are created on the first folder() call.