add overlay cycling ui #6

half-earth/scripts/ReadOnlyResourceList.cs

@@ -2,7 +2,7 @@ using Godot;
 using System.Collections;
 using System.Collections.Generic;
 
-public class ReadOnlyResourceList<T> : Resource, IReadOnlyList<T> where T : Resource
+public abstract class ReadOnlyResourceList<T> : Resource, IReadOnlyList<T> where T : Resource
 {
     [Export]
     private List<Resource> _resources = new List<Resource>();