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
Fwiw, I like having enumeration values which need to evaluate to a particular integer explicitly assigned to that integer.

I.e.
    enum SystemModel {
        NINTENDO_3DS=0,
        NINTENDO_3DS_XL=1,
        // ...
    };