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
updating HP causes SPD to be updated, which is based on SPA; since SPA
is yet to be updated, we trigger constant updates on an SPA > 15 until
we crash.
just use the SPD IV which is already capped by the pkmdata
(this shouldn't refresh fields anyway when loading... whatever).
Closes#1914
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).
