Merge branch 'master' into htj2c

* master:
  Fix typo. I believe this actually references SMPTE RP 2057 "Text-Based Metadata Carriage in MXF" (implemented as part of commit f4061a21fffad4fdf8dbb2f193f0f0960b25421c).
  Fix Object ref not being written: this prevented GenericStreamTextBasedSet to be correctly linked to TextBasedDMFramework