any work with those.
- TLB_ReadTypeLib now retrieves the length of the TLB and passes it to
  the TLB constructor which initializes TLBContext::length to that
  value.
- For non-standard pointed types, td[3] is always 0. I observed that
  the type is stored at td[2]/8 and not td[3]/8.
- Null-pointer exception occurs when GetRefTypeOfImplType is called on a
  type with no inherited interfaces. If the implemented types linked list
  is empty, set pRefType as 0 and return S_OK.