secur32: Getting real functionality into the NTLM provider

[Kai Blin]

NTLM will now authenticate a client against a remote server using
ntlm_auth. So far, only the ANSI functions will work. I still didn't
figure out how to call ntlm_auth using unicode parameters.

dispatcher.c runs ntlm_auth to do authentication. This will also be 
used by the Negotiate provider.

base64_codec.c converts to and from base64 encoding, which is used by
ntlm_auth.

Also added some NTLM-specific tests.

Changelog:
Kai Blin <blin at gmx.net>
Get client functionality into NTLM package, update the tests.


-- 
Kai Blin, (blin at gmx dot net)