Merge some of the features in the mainline NNS contract

[fyrchik]

This is an issue for tracking differences between our NNS implementation and neo-go/C# one.
https://github.com/neo-project/non-native-contracts/tree/master/src/NameService

1. New record type: SOA (Support zone transfer in NNS contract #125).
2. DNS RFC compliance Fix maxDomainNameFragmentLength #238, nns: allow hyphen in names #183 and Make NNS more like DNS #139.
3. getRecord, resolve may return an array. The name for some functions is changed correspondingly.
4. Root domain no longer has a special interface (Make NNS more like DNS #139), but registration should be approved by a committee.
5. Arbitrary level domains nns: allow to register arbitrary-level domains #175 (each domain can have it's own admin, which approves subdomain registration). I think we stiil have some bugs regarding trasfer/adding records/expiration, need to discuss and write our spec here).

cc @roman-khimov

[roman-khimov]

getRecord, resolve may return an array
Root domain no longer has a special interface
Arbitrary level domains

Wow. That's huge. Now I'm thinking if any NNS wrapper makes any sense at this stage, C# one is not used anywhere, NeoFS one differs enough that generic wrapper won't work for it.

[roman-khimov]

I think we've done everything we can here:

• NameService: minor improvements, part 1 neo-project/non-native-contracts#23
• NameService: minor improvements, part 2 neo-project/non-native-contracts#25
• NameService: minor improvements, part 3 neo-project/non-native-contracts#26
• NameService: minor improvements, part 4  neo-project/non-native-contracts#27
• NameService: minor improvements, part 5 neo-project/non-native-contracts#29

But we have diverged again since because of NeoFS requirements and likely that's to stay (C# contracts are not maintained at all). So, obsolete, wontfix.