Further work on refactor to interface based scripts

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

@@ -6,10 +6,10 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Moves;
 /// Implements the secondary effect of Perish Song, which causes all Pokemon on the field to faint in 3 turns.
 /// </summary>
 [Script(ScriptCategory.Move, "perish_song")]
-public class PerishSong : Script
+public class PerishSong : Script, IScriptOnSecondaryEffect
 {
     /// <inheritdoc />
-    public override void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit)
+    public void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit)
     {
         if (move.User.Volatile.Contains<PerishSongEffect>())
             return;