Resolve memory issue with Event Hooks.

src/Battling/EventHooks/EventData.hpp

@@ -9,6 +9,7 @@ namespace CreatureLib::Battling {
 
     class EventData {
     public:
+        virtual ~EventData() = default;
         virtual EventDataKind GetKind() = 0;
     };
 

src/Battling/EventHooks/EventHook.hpp

@@ -19,6 +19,7 @@ namespace CreatureLib::Battling {
             for (auto listener : _listeners) {
                 listener(eventData);
             }
+            delete eventData;
         }
     };
 }