NPC refactor (#10122)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Shared/Weapons/Ranged/Events/MuzzleFlashEvent.cs

@@ -11,9 +11,15 @@ public sealed class MuzzleFlashEvent : EntityEventArgs
     public EntityUid Uid;
     public string Prototype;
 
-    public MuzzleFlashEvent(EntityUid uid, string prototype)
+    /// <summary>
+    /// Should the effect match the rotation of the entity.
+    /// </summary>
+    public bool MatchRotation;
+
+    public MuzzleFlashEvent(EntityUid uid, string prototype, bool matchRotation = false)
     {
         Uid = uid;
         Prototype = prototype;
+        MatchRotation = matchRotation;
     }
 }