Implemented storage button on Inventory

Adds a small button on the bottom right of Storage items when inside the inventory. When the button is pressed it opens the Storage UI.

Content.Server/GameObjects/Components/GUI/InventoryComponent.cs

@@ -262,6 +262,12 @@ namespace Content.Server.GameObjects
                     if (playerentity == Owner)
                         HandleInventoryMessage(msg);
                     break;
+                case OpenSlotStorageUIMessage msg:
+                    ItemComponent item = GetSlotItem(msg.Slot);
+                    ServerStorageComponent storage;
+                    if (item.Owner.TryGetComponent(out storage))
+                        storage.OpenStorageUI(Owner);
+                    break;
             }
         }