Add "PROXY protocol" Support -> quick win: DoH, DOT, DNSCrypt, Loadbalancing, dns rulesets with dnsdist

[christian82]

EDNS works

Support for add-subnet option from dnsmasq (ECS/EDNS0 Client Subnet)

WOW, I have waited so long for this option I would have liked to solve this with the proxy protocol, but it works for now. Maybe the proxy protocol will be implemented as well. So far I have tested the following, and Pihole now receives the IP address of the requesting client. Dns over port 53 (lokal network): LAN -(port 53)-> dnsdist -(dns,53, docker internal)-> pihole --(dns,53, docker internal)-> unbound DoH: Internet -(HTTPS,443)-> Haproxy -(HTTP,80, docker internal)-> …