fix for/for_class parameter that don't match between doc and code #124
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The documentation describing the apply_base_class_role() method of the Mouse::Util::MetaRole package, and other similar methods, explains that it takes "for" parameter.
However, they actually take a parameter with the name "for_class", which can be confusing to users and needs to be fixed.
So in the apply_base_class_role() method, we also use the_fixup_old_style_args() function to convert the old parameter style to the current one.