Build changes

• Fix Halide BUILD rules
• Fix Android build with any Protos

Framework changes

• add symmetric color style option
• InferenceCalculatorAdvancedGL save cache in Open().
• MEDIAPIPE_NODE/SUBGRAPH_IMPLEMENTATION to use common define for registration
• Generalize non-define registration with MEDIAPIPE_STATIC_REGISTRATOR_TEMPLATE
• Discard outdated packets earlier in MuxInputStreamHandler.
• Replace CHECK with RET_CHECK in GetContract() implementation from six calculators.
• Move waitOnCpu and waitOnGpu out of the synchronized block, which can cause deadlock.
• Adding support for 2 things in tensors_to_image_calculator:
• C++ Image segmenter add output size parameters.
• Add C Headers for Text Classifier

MediaPipe Tasks update

This section should highlight the changes that are done specifically for any platform and don't propagate to other platforms.

Android

• Add proto3 Any proto support for Java task api
• Java API add visibility and presence for landmarks.

iOS

• Changed left and right image orientation angles to match iOS UIImageOrientation
• Updated documentation of MPImage
• Added missing headers in ios vision framework build
• Fixed swift name of iOS face landmarker delegate
• Added iOS Image Segmenter Header

Javascript

• Add angle to BoundingBox
• Support WASM asset loading for MediaPipe Task Web
• Update WASM binaries for 0.10.3 release

Model Maker changes

• Model Maker allow core dataset library to handle datasets with unknown sizes.
• No public description
• Add class weights to core hyperparameters and classifier library.
• Move evaluation onto GPU/TPU hardware if available.

MediaPipe Dependencies

• Update glog to 0.6
• Removed internal dependency on OpenCV 3.x, migrating it to OpenCV 4.x