biggest gridinv update OF ALL TIME (#25834)

* add SaveItemLocation keybind

* make item direction public to avoid having to change between Angle for no reason

* add item location saving

* show

* Added a better save keybind, made it draw saved positions, and trying to save in a position it has already been saved in removes that position.

* w

* code style

* Make taken spots appear blue

* style

* !

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>
Co-authored-by: notquitehadouken <tripwiregamer@gmail.com>
Co-authored-by: I.K <45953835+notquitehadouken@users.noreply.github.com>

Content.Client/UserInterface/Systems/Storage/StorageUIController.cs

@@ -240,6 +240,16 @@ public sealed class StorageUIController : UIController, IOnSystemChanged<Storage
 
             args.Handle();
         }
+        else if (args.Function == ContentKeyFunctions.SaveItemLocation)
+        {
+            if (_container?.StorageEntity is not {} storage)
+                return;
+
+            _entity.RaisePredictiveEvent(new StorageSaveItemLocationEvent(
+                _entity.GetNetEntity(control.Entity),
+                _entity.GetNetEntity(storage)));
+            args.Handle();
+        }
         else if (args.Function == ContentKeyFunctions.ExamineEntity)
         {
             _entity.System<ExamineSystem>().DoExamine(control.Entity);