Add chariot, fix water room doors, add item picked up message

src/items/Inventory.cs

@@ -31,6 +31,8 @@ public interface IInventory : INode
 
   event Inventory.InventoryAtCapacityEventHandler InventoryAtCapacity;
 
+  event Inventory.PickedUpItemEventHandler PickedUpItem;
+
   event Inventory.AccessoryUnequippedEventHandler AccessoryUnequipped;
 }
 
@@ -45,6 +47,8 @@ public partial class Inventory : Node, IInventory
   public delegate void AccessoryUnequippedEventHandler(AccessoryStats unequippedAccessory);
   [Signal]
   public delegate void RaiseStatRequestEventHandler(ConsumableItemStats consumableItemStats);
+  [Signal]
+  public delegate void PickedUpItemEventHandler(string pickedUpItemName);
 
   public Inventory()
   {
@@ -71,6 +75,7 @@ public partial class Inventory : Node, IInventory
     }
 
     Items.Add(inventoryItem);
+    EmitSignal(SignalName.PickedUpItem, inventoryItem.Info.Name);
     return true;
   }