Actual lockers (#195)

Adds storing entities into lockers the way we all know and love.
Relies on an implementation of ITileDefinition in https://github.com/space-wizards/space-station-14/pull/193 (just like origin/master)
#191

Content.Shared/GameObjects/Components/Storage/SharedStorageComponent.cs

@@ -7,7 +7,7 @@ namespace Content.Shared.GameObjects.Components.Storage
 {
     public abstract class SharedStorageComponent : Component
     {
-        public sealed override string Name => "Storage";
+        public override string Name => "Storage";
         public override uint? NetID => ContentNetIDs.INVENTORY;
         public override Type StateType => typeof(StorageComponentState);
 

Content.Shared/GameObjects/ContentNetIDs.cs

@@ -17,5 +17,6 @@
         public const uint SOUND = 1012;
         public const uint ITEM = 1013;
         public const uint CLOTHING = 1014;
+        public const uint ENTITYSTORAGE = 1015;
     }
 }