Show other speso colours, add larger denominations (Frontier#1496) (#37030)

Content.Shared/Stacks/StackThresholdComponent.cs

@@ -0,0 +1,19 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Stacks;
+
+/// <summary>
+/// Denotes an item as having thresholded stack visuals.
+/// StackComponent.LayerFunction should be set to Threshold to use this in practice.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed partial class StackLayerThresholdComponent : Component
+{
+    /// <summary>
+    /// A list of thresholds to check against the number of things in the stack.
+    /// Each exceeded threshold will cause the next layer to be displayed.
+    /// Should be sorted in ascending order.
+    /// </summary>
+    [DataField(required: true)]
+    public List<int> Thresholds = new();
+}