* add esrgan model, refine codes

* add some custom gan models

* add animeganv2 network and dataset
* animegan:refine code,add License
Co-authored-by: Nqingqing01 <dangqingqing@baidu.com>

* Update README
* Change docs dir to en_US and zh_CN
* Add paper reference
* Fix link

* add video restore tutorial

* refine code

* test

* fix apps

* update readme

* rm unused code

* fix apps output when input is image

* clean code

* update requirements.txt