Resolves PowerChargerVisualizer is Obsolete (#13901)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/PowerCell/PowerChargerVisualizerSystem.cs

@@ -0,0 +1,41 @@
+using Content.Shared.Power;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.PowerCell;
+
+public sealed class PowerChargerVisualizerSystem : VisualizerSystem<PowerChargerVisualsComponent>
+{
+    protected override void OnAppearanceChange(EntityUid uid, PowerChargerVisualsComponent comp, ref AppearanceChangeEvent args)
+    {
+        if (args.Sprite == null)
+            return;
+
+        // Update base item
+        if (AppearanceSystem.TryGetData<bool>(uid, CellVisual.Occupied, out var occupied, args.Component) && occupied)
+        {
+            // TODO: don't throw if it doesn't have a full state
+            args.Sprite.LayerSetState(PowerChargerVisualLayers.Base, comp.OccupiedState);
+        }
+        else
+        {
+            args.Sprite.LayerSetState(PowerChargerVisualLayers.Base, comp.EmptyState);
+        }
+
+        // Update lighting
+        if (AppearanceSystem.TryGetData<CellChargerStatus>(uid, CellVisual.Light, out var status, args.Component)
+        &&  comp.LightStates.TryGetValue(status, out var lightState))
+        {
+            args.Sprite.LayerSetState(PowerChargerVisualLayers.Light, lightState);
+            args.Sprite.LayerSetVisible(PowerChargerVisualLayers.Light, true);
+        }
+        else
+            // 
+            args.Sprite.LayerSetVisible(PowerChargerVisualLayers.Light, false);
+    }
+}
+
+enum PowerChargerVisualLayers : byte
+{
+    Base,
+    Light,
+}