* added reverb/noisify/AudioReader/RandomChoice/RandomApply

* bug fixed

* transform name changes

* work around for bug in paddle's groupnorm

* upgraded to use float64 inside for high numerical acc

* fixed docstring, add nn.Layer as super for Noisify

* fixed docstring

* added mfcc func/trans and dct function

* updated unit test

* add dtype to control datatype in win function

* add dtype control in transforms

* add dtype control in functionals

* updated test

* added dtype control, updated test