v1.7.0

• Added support for copying any AAFObjects between files
  • Added aaf_merge example showing how to use copy method
• Added cfb viewer utility
• Fix miss-labeled dnx profiles and add 24/60 fps variants
• Updates to embed media tool
  • Renamed tool to aaf_embed_media_tool
  • Migrated from optparse to argparse
  • Audio channel get separated into individual streams