Fix Hands Crash (#122)

* Fixed sprite issues with construction system (Thanks PJB!).

* Storage and Hands Systems now subscribe to Transform Parent changes, and will keep their containers in sync.

* Add check in Interaction System to prevent processing client-side entities on the server.

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

@@ -111,7 +111,7 @@ namespace Content.Server.GameObjects
                 return false;
             }
 
-            clothing.EquippedToSlot(inventorySlot);
+            clothing.EquippedToSlot();
 
             Dirty();
             return true;

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

@@ -71,6 +71,21 @@ namespace Content.Server.GameObjects
             }
         }
 
+        /// <inheritdoc />
+        public void RemoveHandEntity(IEntity entity)
+        {
+            if(entity == null)
+                return;
+
+            foreach (var slot in hands.Values)
+            {
+                if (slot.ContainedEntity == entity)
+                {
+                    slot.Remove(entity);
+                }
+            }
+        }
+
         public ItemComponent GetHand(string index)
         {
             var slot = hands[index];

Content.Server/GameObjects/Components/Items/Storage/ItemComponent.cs

@@ -18,7 +18,7 @@ namespace Content.Server.GameObjects
             }
         }
 
-        public void EquippedToSlot(ContainerSlot slot)
+        public void EquippedToSlot()
         {
             foreach (var component in Owner.GetAllComponents<ISpriteRenderableComponent>())
             {

Content.Server/GameObjects/Components/Items/Storage/ServerStorageComponent.cs

@@ -14,6 +14,7 @@ using SS14.Shared.IoC;
 using SS14.Shared.Log;
 using SS14.Shared.Serialization;
 using System.Collections.Generic;
+using SS14.Shared.GameObjects.EntitySystemMessages;
 using SS14.Shared.ViewVariables;
 
 namespace Content.Server.GameObjects
@@ -70,7 +71,7 @@ namespace Content.Server.GameObjects
         /// </summary>
         /// <param name="toremove"></param>
         /// <returns></returns>
-        bool Remove(IEntity toremove)
+        public bool Remove(IEntity toremove)
         {
             _ensureInitialCalculated();
             if (storage.Remove(toremove))
@@ -88,7 +89,7 @@ namespace Content.Server.GameObjects
         /// </summary>
         /// <param name="toinsert"></param>
         /// <returns></returns>
-        bool Insert(IEntity toinsert)
+        public bool Insert(IEntity toinsert)
         {
             if (CanInsert(toinsert) && storage.Insert(toinsert))
             {
@@ -105,7 +106,7 @@ namespace Content.Server.GameObjects
         /// </summary>
         /// <param name="toinsert"></param>
         /// <returns></returns>
-        bool CanInsert(IEntity toinsert)
+        public bool CanInsert(IEntity toinsert)
         {
             _ensureInitialCalculated();
             if (toinsert.TryGetComponent(out StoreableComponent store))