Шейдеры на лампочки (#655)

* +light shader

* fixed

* toggling logic

* nice

* add option to settings

---------

Co-authored-by: CaYpeN1 <artem7771art@gmail.com>

Content.Client/_White/Lighting/Shaders/LightingOverlaySystem.cs

@@ -0,0 +1,25 @@
+using Robust.Client.Graphics;
+using Robust.Shared.Prototypes;
+
+namespace Content.Client._White.Lighting.Shaders;
+
+public sealed class LightingOverlaySystem : EntitySystem
+{
+    [Dependency] private readonly IOverlayManager _overlayManager = default!;
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+    private LightingOverlay _lightingOverlay = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        _lightingOverlay = new LightingOverlay(EntityManager, _prototypeManager);
+        _overlayManager.AddOverlay(_lightingOverlay);
+    }
+
+    public override void Shutdown()
+    {
+        base.Shutdown();
+        _overlayManager.RemoveOverlay(_lightingOverlay);
+    }
+}