Make pointlight setting use an attempt event

Makes it easy for content to add functionality if multiple things try to set it without having to funnel every piece of code through a content system.

Robust.Shared/GameObjects/Components/Light/SharedPointLightComponent.cs

@@ -95,6 +95,15 @@ public float AnimatedRadius
         public string? MaskPath;
     }
 
+    /// <summary>
+    /// Raised directed on an entity when attempting to enable / disable it.
+    /// </summary>
+    [ByRefEvent]
+    public record struct AttemptPointLightToggleEvent(bool Enabled)
+    {
+        public bool Cancelled;
+    }
+
     public sealed class PointLightToggleEvent : EntityEventArgs
     {
         public bool Enabled;

Robust.Shared/GameObjects/Systems/SharedPointLightSystem.cs

@@ -42,6 +42,12 @@ public virtual void SetEnabled(EntityUid uid, bool enabled, SharedPointLightComp
         if (!ResolveLight(uid, ref comp) || enabled == comp.Enabled)
             return;
 
+        var attempt = new AttemptPointLightToggleEvent(enabled);
+        RaiseLocalEvent(uid, ref attempt);
+
+        if (attempt.Cancelled)
+            return;
+
         comp.Enabled = enabled;
         RaiseLocalEvent(uid, new PointLightToggleEvent(comp.Enabled));
         if (!Resolve(uid, ref meta))