Remove CollectionExtensions.Deconstruct

Long live KeyValuePair<,>.Deconstruct

Robust.Shared/Utility/CollectionExtensions.cs

@@ -54,13 +54,6 @@ namespace Robust.Shared.Utility
             return old;
         }
 
-        // So you can do foreach (var (key, value) in dict)
-        // This basically re-implements the CoreFX version because we're using a pretty old version of .NET Framework.
-        // https://github.com/dotnet/roslyn/issues/20393
-        public static void Deconstruct<TKey, TValue>(this KeyValuePair<TKey, TValue> k, out TKey t, out TValue u) {
-            t = k.Key; u = k.Value;
-        }
-
         /// <summary>
         ///     Pop an element from the end of a list, removing it from the list and returning it.
         /// </summary>