Fixed _onBattleField field of Creature leading to cascading errors on release configuration.

src/Battling/Models/Creature.hpp

@@ -39,7 +39,7 @@ namespace CreatureLib::Battling {
 
         Battle* _battle;
         BattleSide* _side;
-        bool _onBattleField;
+        bool _onBattleField = false;
 
         std::string _nickname = "";
         int8_t _talentIndex;