Give Creature a virtual destructor.

src/Battling/Models/Creature.hpp

@@ -52,6 +52,8 @@ namespace CreatureLib::Battling{
                 uint32_t uid, Library::Gender gender, uint8_t coloring, const Library::Item* heldItem, std::string nickname,
                 int8_t talent, std::vector<LearnedAttack*> attacks);
 
+        virtual ~Creature() = default;
+
         const std::string& GetNickname() const;
         const std::string& GetTalent() const;
         void ChangeLevel(int8_t amount);