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.Server/GameObjects/Components/Mobs/ServerStatusEffectsComponent.cs

@@ -0,0 +1,40 @@
+using System.Collections.Generic;
+using Content.Shared.GameObjects.Components.Mobs;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.GameObjects.Components.Mobs
+{
+    [RegisterComponent]
+    [ComponentReference(typeof(SharedStatusEffectsComponent))]
+    public sealed class ServerStatusEffectsComponent : SharedStatusEffectsComponent
+    {
+        private readonly Dictionary<StatusEffect, string> _statusEffects = new Dictionary<StatusEffect, string>();
+
+        public override ComponentState GetComponentState()
+        {
+            return new StatusEffectComponentState(_statusEffects);
+        }
+
+        public void ChangeStatus(StatusEffect effect, string icon)
+        {
+            if (_statusEffects.TryGetValue(effect, out string value) && value == icon)
+            {
+                return;
+            }
+
+            _statusEffects[effect] = icon;
+            Dirty();
+        }
+
+        public void RemoveStatus(StatusEffect effect)
+        {
+            if (!_statusEffects.Remove(effect))
+            {
+                return;
+            }
+
+            Dirty();
+        }
+    }
+
+}