The client side is behaving like a real stunnel now, waiting local connection
and relaying it through the TLS connection and back to the local connection.
The server side is improved, however it doesn't properly relay it to the local
port on the server. For now it prints the message to stdout and reply a constant
to a client. it waits for EOF from the client before finishing.
client/premaster/secret random bytes are now generated by the TLSstate rng
on demand, simplifying the use of basic routines (connect/listen) and the
renegociation process.
also the AES rng is a CPRNG, compared to system.random PRNG, which
might gives a better warmer fuzzy random feeling.
the API stays mostly similar except for clientkeyxchg that need a bytes instead of [word8].
remove lots of unnessary packing/unpacking when setting up ciphers.
