* add tacotron2 readme, test=doc

* update changelog.md, test=doc

[vector] add DER scripts, AMI data preparation scripts

* fix the destructer problem for prefixes

* unified offline and online in ctcdecoders, test=asr

* rename swig_decoders to paddlespeech_ctcdecoders, test=asr

* add reset_stage for ctcdecoder

* fix some problems

* fix ctconline

* fix a bug

* fix the format

* fix 1xt2x

[speechx]add feat of kaldi

[tts] Add speedyspeech multi-speaker support for synthesize_e2e.py

[Others]fix g2p

add esc50 reference

[TTS]Add new tacotron2

[doc]add tts datasets doc, test=doc

[Setup]refactor the version