Refactor SpeciesUI into overlay and status effects (#381)

* Refactor SpeciesUI into overlay and status effects

All components that update the UI will need to use PlayerAttached for cases where the Mind transfers I think.

* Change overlay / status effects to use states

* Change TryRemoveStatus to RemoveStatus

Doesn't return a bool so not trying.
Addressing PJB's feedback.

Content.Shared/GameObjects/Components/Mobs/SharedOverlayEffectsComponent.cs

@@ -0,0 +1,34 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Mobs
+{
+    /// <summary>
+    /// Full screen overlays; Blindness, death, flash, alcohol etc.
+    /// </summary>
+    public abstract class SharedOverlayEffectsComponent : Component
+    {
+        public override string Name => "OverlayEffectsUI";
+        public sealed override uint? NetID => ContentNetIDs.OVERLAYEFFECTS;
+        public sealed override Type StateType => typeof(OverlayEffectComponentState);
+    }
+
+    public enum ScreenEffects
+    {
+        None,
+        CircleMask,
+        GradientCircleMask,
+    }
+
+    [Serializable, NetSerializable]
+    public class OverlayEffectComponentState : ComponentState
+    {
+        public ScreenEffects ScreenEffect;
+
+        public OverlayEffectComponentState(ScreenEffects screenEffect) : base(ContentNetIDs.OVERLAYEFFECTS)
+        {
+            ScreenEffect = screenEffect;
+        }
+    }
+}