Server should support Dualstack IPv6 + IP-Legacy

Minecraft should support two bind-ip addresses in my opinion. One for each IP-Protocol so IPv4 and IPv6.

At the moment when I try to define the option two times in the same file only the last option will be used, so either v4 or v6.
I want to listen to booth protocols on a specific address each, since the host got multiple addresses for each protocol.

Bind to 0.0.0.0 etc. is not in option.

My suggestion to make two variables like bind-ip-v4 and bind-ip-v6