remove WikiaSuperFactory::$setters and helper functions

In a code review of WikiaApp and WikiaSuperFactory, @wyvek and I noticed that the $setters variable and setClassSetters function are not used at all.  Probably because nobody knows about it, but it doesn't seem to be a highly demanded feature. :)

It was a way of passing in an array of function names and variables which the Factory could use to call setX($var) or setY($var) "for" you.

I also removed the "WF" alias since there is not one single reference to it.