Fixed HandsGui and added an icon to access worn inventories (#279)

* Fixed HandsGui children so that HandsGui is clickable

* Added TextureButton for opening Storage items

* Update ClientInventoryComponent.cs

Fixed HandleComponentState so that it only updates the inventory when there are changes.

* 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.Shared/GameObjects/Components/Inventory/SharedInventoryComponent.cs

@@ -78,5 +78,20 @@ namespace Content.Shared.GameObjects
                 Unequip = 1
             }
         }
+
+        /// <summary>
+        /// Component message for opening the Storage UI of item in Slot
+        /// </summary>
+        [Serializable, NetSerializable]
+        public class OpenSlotStorageUIMessage : ComponentMessage
+        {
+            public Slots Slot;
+
+            public OpenSlotStorageUIMessage(Slots slot)
+            {
+                Directed = true;
+                Slot = slot;
+            }
+        }
     }
 }