Support swapping attacks.

Signed-off-by: Deukhoofd <Deukhoofd@gmail.com>

CInterface/Battling/Creature.cpp

@@ -117,4 +117,5 @@ SIMPLE_GET_FUNC(Creature, GetAvailableAttackSlot, uint8_t);
 export uint8_t CreatureLib_Creature_AddAttack(Creature* p, LearnedAttack* attack) { Try(p->AddAttack(attack);) }
 export uint8_t CreatureLib_Creature_ReplaceAttack(Creature* p, size_t index, LearnedAttack* attack) {
     Try(p->ReplaceAttack(index, attack);)
-}
+}
+export uint8_t CreatureLib_Creature_SwapAttack(Creature* p, size_t a, size_t b) { Try(p->SwapAttacks(a, b);) }