Py-real-esrgan

- Support PyPI
- Support arbitrary scale with `--outscale`
- Add RealESRGAN_x2plus.pth model

File list:
- `RealESRGAN_x2plus.pth`

This release is mainly for updating `realesrgan-ncnn-vulkan` executable files.

- We have added Linux/MacOS executable files

- We add back the `tta` option
- We add the function: when the destination folder does not exist, create it!


File list:
- `realesrgan-ncnn-vulkan-20210801-windows.zip`
- `realesrgan-ncnn-vulkan-20210801-macos.zip`
- `realesrgan-ncnn-vulkan-20210801-ubuntu.zip`

This release is mainly for storing pre-trained models and executable files.

- `RealESRGAN-ncnn-vulkan-20210725-windows.zip`

- `RealESRNet_x4plus.pth`
- `ESRGAN_SRx4_DF2KOST_official-ff704c30.pth`

Note that: `RealESRGAN_x4plus.pth` can be found in https://github.com/xinntao/Real-ESRGAN/releases/download/v0.1.0/RealESRGAN_x4plus.pth

This release is mainly for storing pre-trained models and executable files.

1. RealESRGAN-ncnn-vulkan.zip
2. RealESRGAN_x4plus.pth