- [NEW] Afegit clipboard al backend

- [NEW] surfaces ara usa un vector dinàmic
- [FIX] Ajustades dereferenciacions per a arreglar la caiguda de rendiment

source/backends/SDL3/base.cpp

@@ -83,6 +83,14 @@ namespace backend
         return current_state;
     }
 
+    char *clipboard() {
+        return SDL_GetClipboardText();
+    }
+
+    void clipboard(const char* value) {
+        SDL_SetClipboardText(value);
+    }
+
 }
 
 #endif