Store CreatureIndex on Creature, includes helper function to get a creatures party from a battle.

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

src/Battling/Models/CreatureIndex.hpp

@@ -1,8 +1,6 @@
 #ifndef CREATURELIB_CREATUREINDEX_HPP
 #define CREATURELIB_CREATUREINDEX_HPP
 
-#include "Creature.hpp"
-
 namespace CreatureLib::Battling {
     class CreatureIndex {
         uint8_t _side;