fixed: menu navigation, singleton bugs

quit buttons in pause menus are fixed. also the persistent data objects were not deleting themselves if another copy exists, so that's been fixed

Assets/Scripts/DebugSceneSwitcher.cs

@@ -6,10 +6,18 @@ using TMPro;
 
 public class DebugSceneSwitcher : MonoBehaviour
 {
+    public static DebugSceneSwitcher Instance = null;
+
     public bool showDropdown;
 
     void Awake()
     {
+        if (Instance == null) {
+            Instance = this;
+        } else {
+            Destroy(this.gameObject);
+            return;
+        }
         // Keep the object around when we switch scenes
         DontDestroyOnLoad(this.gameObject);
         CreateDropdownOptions();