~优化Mihomo内核MIX模式dns实现，有效防止DNS泄露

~优化DNS设置菜单，增加对用于解析DNS本身域名的DNS设置功能，并兼容纯ipv6环境

scripts/webget.sh

@@ -2333,8 +2333,10 @@ userguide(){
 	if [ -s $openssldir/certs/ca-certificates.crt ];then
 		dns_nameserver='https://doh.360.cn/dns-query, https://dns.alidns.com/dns-query, https://doh.pub/dns-query'
 		dns_fallback='https://cloudflare-dns.com/dns-query, https://dns.google/dns-query, https://doh.opendns.com/dns-query'
+		dns_resolver='https://223.5.5.5/dns-query, 2400:3200::1'
 		setconfig dns_nameserver \'"$dns_nameserver"\'
 		setconfig dns_fallback \'"$dns_fallback"\'
+		setconfig dns_resolver \'"$dns_resolver"\'
 	fi
 	#开启公网访问
 	sethost(){