* The new vocoder Fre-GAN is now supported
* Improved some fregan details
* Fixed the problem that the existing model could not be loaded to continue training when training GAN
* Updated reference papers
* Init new GUI
* Remove unused codes
* Reset layout
* Add samples
* Make framework to support multiple pages
* Add vc mode
* Add preprocessing mode
* Add training mode
* Remove text input in vc mode
* Add entry for GUI and revise readme
* Move requirement together
* Add error raise when no model folder found
* Add readme