Make wielding automatically drop the item on your other hand (#27975)

* Make wielding automatically drop the item on your other hand

* Fix docs

* Remove redundant parameter

* Fix not deleting virtuals on fail

* Make count freeable hands method

* Add popup when dropping item

Content.Shared/Hands/EntitySystems/SharedHandsSystem.cs

@@ -5,7 +5,6 @@ using Content.Shared.Administration.Logs;
 using Content.Shared.Hands.Components;
 using Content.Shared.Interaction;
 using Content.Shared.Inventory.VirtualItem;
-using Content.Shared.Item;
 using Content.Shared.Storage.EntitySystems;
 using Robust.Shared.Containers;
 using Robust.Shared.Input.Binding;
@@ -299,4 +298,16 @@ public abstract partial class SharedHandsSystem
 
         return hands.Hands.TryGetValue(handId, out hand);
     }
+
+    public int CountFreeableHands(Entity<HandsComponent> hands)
+    {
+        var freeable = 0;
+        foreach (var hand in hands.Comp.Hands.Values)
+        {
+            if (hand.IsEmpty || CanDropHeld(hands, hand))
+                freeable++;
+        }
+
+        return freeable;
+    }
 }