* format g2pw

* fix tone sand_hi bugs for Chinese frontend

* fix stats bugs

* fix point bug, test=tts

* fix point bug, test=tts

* update readme for mix tts, test=doc
Co-authored-by: Nliangym <34430015+lym0302@users.noreply.github.com>
Co-authored-by: Nlym0302 <lym0302@foxmail.com>