Added class Data::Ability and made all code use symbols for abilities instead of numbers. Also added class Data::Item but it's unused.

Data/Scripts/012_Battle/001_Battler/007_Battler_UseMove.rb

@@ -216,7 +216,7 @@ class PokeBattle_Battler
       end
     end
     # Stance Change
-    if isSpecies?(:AEGISLASH) && isConst?(@ability,PBAbilities,:STANCECHANGE)
+    if isSpecies?(:AEGISLASH) && @ability == :STANCECHANGE
       if move.damagingMove?
         pbChangeForm(1,_INTL("{1} changed to Blade Forme!",pbThis))
       elsif isConst?(move.id,PBMoves,:KINGSSHIELD)