Storage Component (toolboxes, backpacks, etc) (#57)

* Fix
Finish and update submodule
Comments code, changes network messages
FIXES THE USE INTERACTION SO YOU CAN ACTUALLY ACTIVATE THINGS NOW
Need engine commits
We'll figure out what to do about this shit later eh mates? Maybe have a script in the build process that automatically moves them over to godot/scenes
Changes some prototypes and fixes stuff
Fixes some more bugs, makes storage values show up properly
Part 3
Part 2
Storage Take 1

* Doneso

Content.Server/Interfaces/GameObjects/Components/Items/IHandsComponent.cs

@@ -1,4 +1,4 @@
-using SS14.Shared.Interfaces.GameObjects;
+using SS14.Shared.Interfaces.GameObjects;
 using System.Collections.Generic;
 
 namespace Content.Server.Interfaces.GameObjects
@@ -22,6 +22,11 @@ namespace Content.Server.Interfaces.GameObjects
         /// <returns>The item in the held, null if no item is held</returns>
         IItemComponent GetHand(string index);
 
+        /// <summary>
+        /// Gets item held by the current active hand
+        /// </summary>
+        IItemComponent GetActiveHand { get; }
+
         /// <summary>
         ///     Puts an item into any empty hand, preferring the active hand.
         /// </summary>