Flatpacks and the Flatpacker 1001 (#23338)

* Flatpacker and flatpacks

* ok that's good enough

* convert solars/AME to flatpacks

* mats, mats, we are the mats

* basic mechanics are DONE

* thing

* final UI

* sloth

* rped jumpscare

* rename

Content.Client/Construction/FlatpackSystem.cs

@@ -0,0 +1,48 @@
+using Content.Shared.Construction;
+using Content.Shared.Construction.Components;
+using Robust.Client.GameObjects;
+using Robust.Shared.Prototypes;
+
+namespace Content.Client.Construction;
+
+/// <inheritdoc/>
+public sealed class FlatpackSystem : SharedFlatpackSystem
+{
+    [Dependency] private readonly AppearanceSystem _appearance = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<FlatpackComponent, AppearanceChangeEvent>(OnAppearanceChange);
+    }
+
+    private void OnAppearanceChange(Entity<FlatpackComponent> ent, ref AppearanceChangeEvent args)
+    {
+        var (_, comp) = ent;
+        if (!_appearance.TryGetData<string>(ent, FlatpackVisuals.Machine, out var machineBoardId) || args.Sprite == null)
+            return;
+
+        if (!PrototypeManager.TryIndex<EntityPrototype>(machineBoardId, out var machineBoardPrototype))
+            return;
+
+        if (!machineBoardPrototype.TryGetComponent<SpriteComponent>(out var sprite))
+            return;
+
+        Color? color = null;
+        foreach (var layer in sprite.AllLayers)
+        {
+            if (layer.RsiState.Name is not { } spriteState)
+                continue;
+
+            if (!comp.BoardColors.TryGetValue(spriteState, out var c))
+                continue;
+            color = c;
+            break;
+        }
+
+        if (color != null)
+            args.Sprite.LayerSetColor(FlatpackVisualLayers.Overlay, color.Value);
+    }
+}