Mark several classes as final for devirtualization performance benefits.

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

src/Battling/EventHooks/Events/HealEvent.hpp

@@ -3,7 +3,7 @@
 #include "EventData.hpp"
 
 namespace CreatureLib::Battling {
-    class HealEvent : public EventData {
+    class HealEvent final : public EventData {
         ArbUt::BorrowedPtr<Creature> _creature;
         uint32_t _originalHealth;
         uint32_t _newHealth;