setup damage types and modifiers as resources

interfaces/NodeExtensions.cs

@@ -0,0 +1,12 @@
+using Godot;
+using System.Linq;
+
+namespace Movementtests.interfaces;
+
+public static class NodeExtensions
+{
+    public static IDamageable[] ToIDamageables(this GodotObject[] nodes)
+    {
+        return nodes == null ? System.Array.Empty<IDamageable>() : nodes.OfType<IDamageable>().ToArray();
+    }
+}