Ventoy OpenWrt Plugin

Description

This plugin is used for Ventoy to boot OpenWrt img file.
For more details please refer: https://www.ventoy.net/en/doc_openwrt.html

Update for new OpenWrt release

For example, a new OpenWrt release come (e.g. 21.02.2)

1. git clone this repository.
2. Download the current ventoy_openwrt.xz and run tar xf ventoy_openwrt.xz to decompress it.
3. Download kmod-dax_xxx.ipk and kmod-dm_xxx.ipk for the new OpenWrt release.

The download link is as follows (take 21.02.0-rc1 for example, you need to use the correct version):
https://downloads.openwrt.org/releases/21.02.0-rc1/targets/x86/64/kmods/5.4.111-1-6a923af0c1e0327f4ae0f3ad78f2d1a1/kmod-dax_5.4.111-1_x86_64.ipk  
https://downloads.openwrt.org/releases/21.02.0-rc1/targets/x86/64/kmods/5.4.111-1-6a923af0c1e0327f4ae0f3ad78f2d1a1/kmod-dm_5.4.111-1_x86_64.ipk  

4. run sh newver.sh and it will create a new ventoy_openwrt.xz