invalid/unknown usages were incorrectly interchangable; dex-sets were
looking at Unknown which was impossible for some cases.
only use GameVersion.Unknown as a temp placeholder for later resolution
by the user.
previously was only defined for gen1/2, why not all gens
can now query encounters in Core for encounters per generation via
reflection; can help group encounters for data vis or be faster than
getting individual gen numbers
fix bk4 ribbon checks (lacked interface inheritance)
change MN -> UM for get blank save (unused in PKHeX solution)
prevent inheriting from derived pkm classes
