Finally have friend games working. Matchmaking games do not work yet,
though. There are still a number of bugs to be worked out, but it's
possible to complete a few rounds of Tetris DS successfully.
Contains enough code to allow Tetris DS to get to the post-login wifi
menu.
This is very rough, basic code. I expect it to change quite a bit from
its current format once I start adding more features. It's nowhere near
ready for public use yet.