More abilities, refactor custom triggers to be typed.

Plugins/PkmnLib.Plugin.Gen7/Scripts/Moves/Drain.cs

@@ -23,21 +23,15 @@ public class Drain : Script
         if (move.User.HasHeldItem("big_root"))
             healed = (uint)(healed * 1.3f);
         var invert = false;
-        var parameters = new Dictionary<StringKey, object?>
-        {
-            { "user", user },
-            { "target", target },
-            { "damage", damage },
-            { "healed", healed },
-            { "invert", invert },
-        };
-        target.RunScriptHook(x => x.CustomTrigger(CustomTriggers.ModifyDrain, parameters));
-        if (parameters.TryGetValue("invert", out var invertObj) && invertObj is bool invertBool)
-            invert = invertBool;
+
+        var args = new CustomTriggers.ModifyDrainArgs(move, target, hit, damage, healed, invert);
+        target.RunScriptHook(x => x.CustomTrigger(CustomTriggers.ModifyDrain, args));
+        invert = args.Invert;
+        healed = args.Healed;
 
         if (invert)
         {
-            user.Damage(damage, DamageSource.Misc);
+            user.Damage(healed, DamageSource.Misc);
         }
         else
         {