added simple activeElements list

Scripts/Elements/Element.cs

@@ -38,6 +38,7 @@ public class Element {
         get => active;
         set {
             active = value;
+            Chunk.SetElementActive(this, active);
 
             if (active)
                 Color = originalColor;
@@ -98,5 +99,4 @@ public class Element {
         originalColor = c;
         return c;
     }
-
 }