More abilities, refactor custom triggers to be typed.

PkmnLib.Dynamic/Models/Pokemon.cs

@@ -1023,6 +1023,8 @@ public class PokemonImpl : ScriptSource, IPokemon
             this.RunScriptHook(script => script.ChangeIncomingDamage(this, source, ref dmg));
             damage = dmg;
         }
+        if (damage == 0)
+            return;
 
         // If the damage is more than the current health, we cap it at the current health, to prevent
         // underflow.