Implement Molotov Cocktail

Assets/Battle/Triggers/StepTrigger.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+public class StepTrigger : Trigger {
+
+    private RoundStep step;
+
+    public StepTrigger(RoundStep step, TriggeredEffect callback,
+            TriggerExpiration expiration, TriggerRepetition repetition)
+        : base(callback, expiration, repetition) {
+        this.step = step;
+    }
+
+    public bool IsTriggeredBy(BattleTime time) {
+        return time.RoundStep == this.step;
+    }
+}