dns.mitm: make line ordering explicit, rather than implicit. ...

This doesn't actually change functionality, because this is how std::unordered_map worked anyway...

...but it's better for us to be explicit, I think.

docs: expand dns_mitm wildcard wording

dns.mitm: add documentation

docs/fatal error: update for 0.15.0

docs: address review commentary

docs: correct "nogc" description

docs: style fixes

docs: initial re-write of all documentation