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Actually, the SyncUDPSocket is currently a copy of the UDPSocket. It
needs to get stripped little bit.

* Use the address family instead of v6 boolean.
* Check it by exception.
* Documentation.

(based on the seeming intent), indentation.

The .cc has it defined as "struct" and the .h file referenced a
"class".  This has now been harmonised as "struct".

The dns_service is not tested, so the tests are not added. It is simple
anyway.

and removed empty top level file

and moved them out of internal. Changed the internal/ workaround (to prevent files outside of asiolink/ to indirectly include asio.hpp), the .cc files that include the relevant headers must include asio.hpp themselves (and this is checked in the headers)
Also moved coroutine out of internal.
Tests are still todo (which is why internal/ still exists)