Convert Remaining Atmos Appearance Visualizers (#9582)

* Convert atmos plaque to generic visualizer

Use generic visualizer for atmos plaque. Also enables zumos plaque to
appear.

* Convert gas canister connecters

* Remove manual layer creation

* Remove gas canister visualizer

* Convert gas analyzers to generic visualizers

* Convert fire visualizer

* Fix layers on plasma and air canisters

* Remove commented out fire visualizer in barricades

* Add documentation for fire visuals component

* Remove redundant visualizer for milkalyzer

* Remove rogue item group

Content.Client/Atmos/EntitySystems/FireVisualizerSystem.cs

@@ -0,0 +1,59 @@
+using Content.Client.Atmos.Components;
+using Content.Shared.Atmos;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.Atmos.EntitySystems;
+
+/// <summary>
+/// This handles the display of fire effects on flammable entities.
+/// </summary>
+public sealed class FireVisualizerSystem : VisualizerSystem<FireVisualsComponent>
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<FireVisualsComponent, ComponentInit>(OnComponentInit);
+    }
+
+    private void OnComponentInit(EntityUid uid, FireVisualsComponent component, ComponentInit args)
+    {
+        if (!TryComp<SpriteComponent>(uid, out var sprite))
+            return;
+
+        sprite.LayerMapReserveBlank(FireVisualLayers.Fire);
+        sprite.LayerSetVisible(FireVisualLayers.Fire, false);
+        sprite.LayerSetShader(FireVisualLayers.Fire, "unshaded");
+    }
+
+    protected override void OnAppearanceChange(EntityUid uid, FireVisualsComponent component, ref AppearanceChangeEvent args)
+    {
+        if (!args.Component.TryGetData(FireVisuals.OnFire, out bool onFire) ||
+            !TryComp<SpriteComponent>(component.Owner, out var sprite))
+            return;
+
+        var fireStacks = 0f;
+        if (args.Component.TryGetData(FireVisuals.FireStacks, out float stacks))
+            fireStacks = stacks;
+
+        SetOnFire(sprite, args.Component, component, onFire, fireStacks);
+    }
+
+    private void SetOnFire(SpriteComponent sprite, AppearanceComponent appearance, FireVisualsComponent component, bool onFire, float fireStacks)
+    {
+        if (component.Sprite != null)
+            sprite.LayerSetRSI(FireVisualLayers.Fire, component.Sprite);
+
+        sprite.LayerSetVisible(FireVisualLayers.Fire, onFire);
+
+        if(fireStacks > component.FireStackAlternateState && !string.IsNullOrEmpty(component.AlternateState))
+            sprite.LayerSetState(FireVisualLayers.Fire, component.AlternateState);
+        else
+            sprite.LayerSetState(FireVisualLayers.Fire, component.NormalState);
+    }
+}
+
+public enum FireVisualLayers : byte
+{
+    Fire
+}