Gen5 does not follow the same convention, 0 = non, 1 = rnd, 2 = always;
not gonna bother updating for just that one
bool? occupies 2 bytes; enum:byte is 1 byte.
should probably move validity checking logic into the IEncounterable
objects instead...
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
