Further work on refactor to interface based scripts

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

@@ -3,7 +3,7 @@ using PkmnLib.Plugin.Gen7.Scripts.Side;
 namespace PkmnLib.Plugin.Gen7.Scripts.Moves;
 
 [Script(ScriptCategory.Move, "echoed_voice")]
-public class EchoedVoice : Script
+public class EchoedVoice : Script, IScriptOnSecondaryEffect
 {
     /// <inheritdoc />
     public override void ChangeDamageModifier(IExecutingMove move, IPokemon target, byte hit, ref float modifier)
@@ -20,7 +20,7 @@ public class EchoedVoice : Script
     }
 
     /// <inheritdoc />
-    public override void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit)
+    public void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit)
     {
         var battleData = move.User.BattleData;
         if (battleData == null)