Singularity Shaders and a lot of Shader Stuff (#2517)

* Beginnings of singulo shader

* LOTS of changes!!

* Minor changes

* Singulo stuff

* Aesthetic changes to singulo

* Combining singulo change

* ShaderAura uses IEntities now, not IPlayerSession

* Fixes?

* Fixes draw order for atmos

* using fix

* Address reviews

* nuget.config whaaa

* nuget haha

* nuget why are you so dum

* happy now

* Preparing for omegachange

* Merge from seventh level of hell

* woork

* Ignorecomponents add

* mmf

* RobustToolbox?

* Fixes

* Fixes Robust?

* adds sprite

* Nullables

* Crit overlay stuff

* Commits Robust

Content.Client/GameObjects/EntitySystems/AtmosDebugOverlaySystem.cs

@@ -1,4 +1,5 @@
-#nullable enable
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Client.Atmos;
 using Content.Shared.GameObjects.EntitySystems.Atmos;
@@ -43,7 +44,7 @@ namespace Content.Client.GameObjects.EntitySystems
             _mapManager.OnGridRemoved += OnGridRemoved;
 
             var overlayManager = IoCManager.Resolve<IOverlayManager>();
-            if(!overlayManager.HasOverlay(nameof(AtmosDebugOverlay)))
+            if(!overlayManager.HasOverlay<AtmosDebugOverlay>())
                 overlayManager.AddOverlay(new AtmosDebugOverlay());
         }
 
@@ -62,8 +63,8 @@ namespace Content.Client.GameObjects.EntitySystems
             base.Shutdown();
             _mapManager.OnGridRemoved -= OnGridRemoved;
             var overlayManager = IoCManager.Resolve<IOverlayManager>();
-            if(!overlayManager.HasOverlay(nameof(GasTileOverlay)))
-                overlayManager.RemoveOverlay(nameof(GasTileOverlay));
+            if(!overlayManager.HasOverlay<GasTileOverlay>())
+                overlayManager.RemoveOverlay<GasTileOverlay>();
         }
 
         public void Reset()