Fire extinguisher safety (#4912)

* Moved safety into FireExtinguisherComponent.

* Fix errant find and replace

* Address reviews

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/Extinguisher/FireExtinguisherVisualizer.cs

@@ -0,0 +1,38 @@
+using Content.Shared.Extinguisher;
+using JetBrains.Annotations;
+using Robust.Client.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Client.Extinguisher
+{
+    [UsedImplicitly]
+    public class FireExtinguisherVisualizer : AppearanceVisualizer
+    {
+        [DataField("safety_on_state")]
+        private string? _safetyOnState;
+        [DataField("safety_off_state")]
+        private string? _safetyOffState;
+
+        public override void OnChangeData(AppearanceComponent component)
+        {
+            base.OnChangeData(component);
+
+            if (component.TryGetData<bool>(FireExtinguisherVisuals.Safety, out var safety))
+            {
+                SetSafety(component, safety);
+            }
+        }
+
+        private void SetSafety(AppearanceComponent component, bool safety)
+        {
+            var sprite = component.Owner.GetComponent<ISpriteComponent>();
+
+            sprite.LayerSetState(FireExtinguisherVisualLayers.Base, safety ? _safetyOnState : _safetyOffState);
+        }
+    }
+
+    public enum FireExtinguisherVisualLayers : byte
+    {
+        Base
+    }
+}