Implement Triggers and Scarring

Assets/Battle/Triggers/DamageTrigger.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+public class DamageTrigger : Trigger {
+
+    private List<BattleParticipant> observedParticipants;
+
+    public DamageTrigger(List<BattleParticipant> observedParticipants, TriggeredEffect callback,
+            TriggerExpiration expiration, TriggerRepetition repetition)
+        : base(callback, expiration, repetition) {
+        this.observedParticipants = observedParticipants;
+    }
+
+    public bool IsTriggeredBy(DealDamageEffect effect) {
+        return effect.Amount > 0 && this.observedParticipants.Contains(effect.Target);
+    }
+}