MediaPipe v0.6.8 - AutoFlip: Automatic video cropping desktop pipeline

MediaPipe v0.6.8 - AutoFlip: Automatic video cropping desktop pipeline

• MediaPipe AutoFlip desktop example
• Bazel maximum version check (version 1.2.1)
• Added way to extract detection protos from object detection android mobile GPU example
• Bug fixes
  • previous_loopback_calculator
  • split_vector_calculator
  • scale_image_calculator
• Documentation
• MediaPipe AutoFlip documentation
• Fixes for framework concept, coral face and object detection docs