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.Shared/Storage/StorageComponent.cs

@@ -32,6 +32,14 @@ namespace Content.Shared.Storage
         [DataField, ViewVariables(VVAccess.ReadWrite)]
         public Dictionary<EntityUid, ItemStorageLocation> StoredItems = new();
 
+        /// <summary>
+        /// A dictionary storing each saved item to its location in the grid.
+        /// When trying to quick insert an item, if there is an empty location with the same name it will be placed there.
+        /// Multiple items with the same name can be saved, they will be checked individually.
+        /// </summary>
+        [DataField]
+        public Dictionary<string, List<ItemStorageLocation>> SavedLocations = new();
+
         /// <summary>
         /// A list of boxes that comprise a combined grid that determines the location that items can be stored.
         /// </summary>
@@ -171,6 +179,20 @@ namespace Content.Shared.Storage
         }
     }
 
+    [Serializable, NetSerializable]
+    public sealed class StorageSaveItemLocationEvent : EntityEventArgs
+    {
+        public readonly NetEntity Item;
+
+        public readonly NetEntity Storage;
+
+        public StorageSaveItemLocationEvent(NetEntity item, NetEntity storage)
+        {
+            Item = item;
+            Storage = storage;
+        }
+    }
+
 
     /// <summary>
     /// Network event for displaying an animation of entities flying into a storage entity