SetConfig Update

Some seriously sloppy (though, non-breaking) code was cleaned up and
modified.

A couple bugfixes noticed during testing taken care of.

Removed functionality of changing to a focus other than 'file', as,
currently, other formats are unsupported.
Less Variables!

Removed the whitelistOn boolean, in the main class.

In the future, I will remove the focusOn string variable, as well.
However, for now, it serves it's purpose.