Decouple interactions from hands, cleanup old events, add new fears (#28393)

* ok basic shit

* second part

* pretend it isn't real it can't hurt you.

* 👁️ 👁️

* shadowcommander review

Content.Server/Atmos/Piping/Trinary/EntitySystems/GasMixerSystem.cs

@@ -139,6 +139,9 @@ namespace Content.Server.Atmos.Piping.Trinary.EntitySystems
 
         private void OnMixerActivate(EntityUid uid, GasMixerComponent mixer, ActivateInWorldEvent args)
         {
+            if (args.Handled || !args.Complex)
+                return;
+
             if (!EntityManager.TryGetComponent(args.User, out ActorComponent? actor))
                 return;