Add FindUniqueMonster

Source/monster.cpp

@@ -4392,6 +4392,17 @@ Monster *FindMonsterAtPosition(Point position, bool ignoreMovingMonsters)
 	return &Monsters[abs(monsterId) - 1];
 }
 
+Monster *FindUniqueMonster(UniqueMonsterType monsterType)
+{
+	for (size_t i = 0; i < ActiveMonsterCount; i++) {
+		int monsterId = ActiveMonsters[i];
+		auto &monster = Monsters[monsterId];
+		if (monster.uniqueType == monsterType)
+			return &monster;
+	}
+	return nullptr;
+}
+
 bool IsTileAvailable(const Monster &monster, Point position)
 {
 	if (!IsTileAvailable(position))

Source/monster.h

@@ -489,6 +489,7 @@ void PlayEffect(Monster &monster, MonsterSound mode);
 void MissToMonst(Missile &missile, Point position);
 
 Monster *FindMonsterAtPosition(Point position, bool ignoreMovingMonsters = false);
+Monster *FindUniqueMonster(UniqueMonsterType monsterType);
 
 /**
  * @brief Check that the given tile is available to the monster