Adds InRangeUnobstructed method to InteractionSystem (#698)

* You cannot pickup items across walls, or pickup items when dead/in crit.

* Adds InRangeUnobstructed method to InteractionSystem.
Changes HandsSystem and ItemComponent to use it.

Content.Server/GameObjects/EntitySystems/ActionBlockerSystem.cs

@@ -17,6 +17,8 @@ namespace Content.Server.GameObjects.EntitySystems
 
         bool CanDrop();
 
+        bool CanPickup();
+
         bool CanEmote();
     }
 
@@ -81,7 +83,17 @@ namespace Content.Server.GameObjects.EntitySystems
             }
             return candrop;
 		}
-            
+
+        public static bool CanPickup(IEntity entity)
+        {
+            bool canpickup = true;
+            foreach (var actionblockercomponents in entity.GetAllComponents<IActionBlocker>())
+            {
+                canpickup &= actionblockercomponents.CanPickup();
+            }
+            return canpickup;
+        }
+
         public static bool CanEmote(IEntity entity)
         {
             bool canemote = true;