Updated WhatsAppApi.dll with a little hack
Fixed tx message decryption

WOOHOO FUCK YEAH FINALLY!!!
The trick was using the two different key streams, one for incoming and
one for outgoing data.
Bumped up version number to 1.2.1.0
Added reset of outgoing key

Ooooh almost fucked that one up before releasing 1.2.1.0    :')
Added build v1.2.1.0

- Fixed HTTPS Content-Length exception (hopefully, untested)
- Fixed tx message decrypt
- Removed tx/rx prefix in b64raw.log