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
Should have an assert or even an always-enabled check for out-of-bounds access, I think? (after all, this value is provided by the user and might very well to out-of-bounds..)