Item/statuseffect optimization:

- PowerTransfer components cache power connections instead of rechecking them every frame
- items store connections in a dictionary with the name of the connection as a key (-> finding the correct connection when sending a signal is more efficient)
- storing item tags & StatusEffect targetNames in HashSets

Subsurface/Source/Items/Components/ItemComponent.cs

@@ -374,7 +374,7 @@ namespace Barotrauma.Items.Components
                 return;
             }
 
-            List<ItemSound> matchingSounds = null;
+            List<ItemSound> matchingSounds;
             if (!sounds.TryGetValue(type, out matchingSounds)) return;
 
             ItemSound itemSound = null;