Add IPv6 support for RPC server - Transmission

I know it’s possible, because there are versions found in GitHub that support it. Like this:

I currently run my own transmission-daemon on my Pi, that supports ipv6. But it would be really nice if the Transmission from the official OSMC App Store added this feature, so we could just install OSMC on a ipv6 network and be ready to go.

I’d prefer to bundle the official version unless the patches need to get IPV6 working are small and well maintained