- now that we have offset tables to type, we can cleanly
  parse the field-lists and remove the associated kludges
- also adding internal structure for easing parameter sharing
  across functions (codeview_type_parse)
- in mscvpdb.h, also reparated the type records that are
  referenced from other type records (union codeview_type_ref)
  from type records referenced by symbols (union codeview_type)