reduce pk3/ck3/xk3 logic, share AbilityBit property within _K3, and when
loading, type check (favored over hardcoding individual load cases)
pull some non-gui code from PKMEditor to core/etc for general data
fetching
Closes#2004
no changes had been submitted since originally committed on 3/5/2015; 3y
of inactivity.
users can always place "lang_en" to replace the english translation with
their own GUI strings; not worth maintaining non-series language
support.
