Add proper license header and tests to hash functions for the lobby

[leper]

We should add the proper license header to pbkdf2 and hmac_sha256 from sha.cpp. IIRC those are from OpenBSD.

Those functions also need some tests to verify that they do what they should. (Related: r14123)

[Josh]

The tests can wait for Alpha 16. I'll try to straighten out the licence headers tonight.

[JoshuaJB]

In 14349:

Add proper licence header and remove tyedefs in sha.cpp/h. Refs #2308

[JoshuaJB]

In 14350:

Seperate differently licenced portions of sha.cpp/h into pkcs5_pdkdf2.cpp/h and remove some extra std includes in sha.cpp. Refs #2308

[leper]

It'd also be nice to move all of that code somewhere were it makes sense (and it is easily seen that we did take that from somewhere else (like the stuff in third_party)), but that can be done for A16.

[ben]

In 14357:

Updates license files for gloox, MiniUPnPc, and pkcs5_pbkdf2. Refs #2308

[JoshuaJB]

In 14595:

Move lobby encryption code to third_party/encryption and add tests. Fixes #2308

[historic_bruno]

Is it intentional that the header files are MIT licensed instead of GPL 2 or later? I guess it's not a problem if there's a reason, but it's somewhat out of place inside source/.

[JoshuaJB]

In 14602:

Change the licence of sha.h to match the licence of sha.cpp. Refs #2308

[Josh]

Thanks for catching that, I changed sha.h to GPL2+ so it matches sha.cpp but I'm going to leave the other header as MIT so it best matches its cpp file.

[ben]

In 14617:

Updates LICENSE.txt for r14602, refs #2308.
Sets svn:ignore property on generated cpp from encryption tests.