Wes v0.7.0

• Made TrackEdit.cloneTrack() into a generic method. (API change)
• Finalized the AnimationEdit and TrackEdit classes. (API change)
• Bugfix: TrackEdit.reverse() assumes a MorphTrack has a exactly one target
• Added 7 public methods:
  • AnimationEdit.convertToInPlace()
  • Pose.findSkeleton()
  • TrackEdit.behead() for a MorphTrack
  • TrackEdit.convertToInPlace()
  • TrackEdit.removeRepeats() for a MorphTrack
  • TrackEdit.setDuration() for a MorphTrack
  • TrackEdit.truncate() for a MorphTrack
• Based on v7.3.0 of the Heart Library and v0.9.9 of Acorus.