v1.6.1

• Run the g2pW model through piper.g2pw_onnx instead of g2pw.api, dropping torch (~750 MB installed) and requests from the zh extra
  • g2pw.api imports torch only to build padded tensors and iterate batches; the model itself already ran under onnxruntime
  • Also 1.5-2x faster, since it no longer forks DataLoader worker processes on every call
  • g2pW is still required, for its pinyin/bopomofo lookup tables