Wrap SDL event type enum (partially)

src/core/engine.cppm

@@ -83,7 +83,7 @@ export namespace core
             // Handles an SDL event. Returns true if the event has been handled.
             bool handle_event(const sdl::Event* event)
             {
-                if (event->type == SDL_EVENT_QUIT) {
+                if (event->type == sdl::EventType::Quit) {
                     // Exit the application
                     keep_running_ = false;
                     return true;