C++ version of openWakeWord.

1. Download a release of the onnxruntime and extract to lib/<arch> where <arch> is uname -m.
2. Run make

After building, run:

arecord -r 16000 -c 1 -f S16_LE -t raw - | \
  build/openwakeword --model models/alexa_v0.1.onnx

You can add multiple --model <path> arguments. See --help for more options.