Configuration files

Do not merge - this is a preliminary PR for discussion.

As of now, incorporates Dolphin's INI code for a configuration system. So far, handles for input controls have been added, but they haven't been hooked yet into the parts of code that use them. 
Nit: With the 'b' this is not consistent with what the button is called on the 3DS unit. Should just be "pad_l" and "pad_r"