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

src/core/file_sys/archive_backend.h

@@ -45,6 +45,11 @@ public:
     {
     }
 
+    Path(const char* path):
+        type(Char), string(path)
+    {
+    }
+
     Path(LowPathType type, u32 size, u32 pointer):
         type(type)
     {