* update wfst script

* add skip blank

* support vad ios compile

* support onnx model recognize

* add build ios sh

* rename speechx

* fix wfst decode error

* replace reset with make_unique

* fix openfst download error

* add acknowledgments of openfst

* refactor directory

* clean ctc_decoders dir

* add nnet cache && make 2 thread work

* do not compile websocket

* rm ds2 && rm boost

* rm ds2 example

* refactor directory