Add isMeleeAttacker to Unit

lib/battle/CUnitState.cpp

@@ -545,6 +545,22 @@ bool CUnitState::isShooter() const
 	return shots.total() > 0;
 }
 
+bool CUnitState::isMeleeAttacker() const
+{
+	//exclude non melee attackers
+	static const std::set<CreatureID> nonMeleeAttackers{
+		CreatureID::FIRST_AID_TENT,
+		CreatureID::CATAPULT,
+		CreatureID::BALLISTA,
+		CreatureID::AMMO_CART,
+		CreatureID::ARROW_TOWERS
+	};
+	if (vstd::contains(nonMeleeAttackers, creatureId()))
+		return false;
+
+	return true;
+}
+
 int32_t CUnitState::getKilled() const
 {
 	int32_t res = unitBaseAmount() - health.getCount() + health.getResurrected();