CFG: Implemented the GetConfigInfoBlk2 function.

Added a "config" file to the CFG process service (CFG:U), and added a few default blocks to it.

Implemented GetSystemModel and GetModelNintendo2DS
> stored at byte offset 2 within the structure (and not padded to byte offset 2)
You probably made a mistake here? Either way, the structure already has natural alignment, so `pack` shouldn't be necessary.