Get rid of the OverlayEffectsComponent stuff (#3010)

* Get rid of the OverlayEffectsComponent stuff because it just ended up creating workarounds for it's bugs, without removing any functionality

* Flashes and Flashbangs use the same code now (the Flashable path because it's better)

Content.Client/Graphics/Overlays/GradientCircleMask.cs

@@ -1,8 +1,10 @@
 using Content.Shared.GameObjects.Components.Mobs;
+using Content.Shared.GameObjects.Components.Mobs.State;
 using Robust.Client.Graphics.Drawing;
 using Robust.Client.Graphics.Overlays;
 using Robust.Client.Graphics.Shaders;
 using Robust.Client.Interfaces.Graphics.ClientEye;
+using Robust.Client.Player;
 using Robust.Shared.IoC;
 using Robust.Shared.Maths;
 using Robust.Shared.Prototypes;
@@ -13,18 +15,43 @@ namespace Content.Client.Graphics.Overlays
     {
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
         [Dependency] private readonly IEyeManager _eyeManager = default!;
+        [Dependency] private readonly IPlayerManager _playerManager = default!;
 
         public override OverlaySpace Space => OverlaySpace.WorldSpace;
         private readonly ShaderInstance _shader;
 
-        public GradientCircleMaskOverlay() : base(nameof(SharedOverlayID.GradientCircleMaskOverlay))
+        public GradientCircleMaskOverlay() : base(nameof(GradientCircleMaskOverlay))
         {
             IoCManager.InjectDependencies(this);
             _shader = _prototypeManager.Index<ShaderPrototype>("GradientCircleMask").Instance();
         }
 
+        public static bool LocalPlayerHasState(IPlayerManager pm, bool critical, bool dead) {
+            var playerEntity = pm.LocalPlayer?.ControlledEntity;
+
+            if (playerEntity == null)
+            {
+                return false;
+            }
+
+            if (playerEntity.TryGetComponent<IMobStateComponent>(out var mobState))
+            {
+                if (critical)
+                    if (mobState.IsCritical())
+                        return true;
+                if (dead)
+                    if (mobState.IsDead())
+                        return true;
+            }
+
+            return false;
+        }
+
         protected override void Draw(DrawingHandleBase handle, OverlaySpace currentSpace)
         {
+            if (!LocalPlayerHasState(_playerManager, true, false))
+                return;
+
             handle.UseShader(_shader);
             var worldHandle = (DrawingHandleWorld)handle;
             var viewport = _eyeManager.GetWorldViewport();