Mark several classes as final for devirtualization performance benefits.

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

src/Battling/EventHooks/Events/SwitchEvent.hpp

@@ -4,7 +4,7 @@
 #include "EventData.hpp"
 
 namespace CreatureLib::Battling {
-    class SwitchEvent : public EventData {
+    class SwitchEvent final : public EventData {
         CreatureIndex _index;
         ArbUt::BorrowedPtr<Creature> _newCreature;