start restructuring asio stream headers

StreamCore is now a nested class of Stream and will soon be hidden from
the public interface. The goal is to offer buffer-handling methods (like
CopyReceivedData) directly in Steam and have StreamCore be responsible
for Botan::TLS::Callbacks implementation only. This will remove the need
to provide StreamCore as a parameter for Async Ops construction.

StreamBase has been removed. Stream no longer decides whether it is a
Client or a Server when constructed, but when performing the handshake.
This resembles the interface of boost::asio::ssl::stream and hides the
implementation detail from the user.
In order to allow testing with mocked TLS::Channels anyways, we use
SPHINAE to setup either a real channel or a mocked channel.

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