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
I there is a guarantee that `data_entries_offset` will be stored at byte offset 2 within the structure (and not padded to byte offset 2)? If not, `#pragma pack(1)` should be used here, probably