WinForms->Core logic absorbing (CommonEdits)
loading ShowdownSet now applies properties to PKM instead of PKMEditor
Contest/IVs for Static/Trades are no longer set by default (less object
allocations), and are now checked by the encounter generator
extract common nature amp logic
generic ienumerable copyto which now returns count of elements copied
(maybe useful later). prior usages never tried to copy an enumerable
larger than the dest array (now length checked).
