Throwable item rework, increase health on timer timeout, add boss 1 model

src/items/throwable/ThrowableItem.cs

@@ -5,7 +5,7 @@ using Godot;
 using System;
 
 [Meta(typeof(IAutoNode))]
-public partial class ThrowableItem : Node3D, IInventoryItem
+public partial class ThrowableItem : Node3D, IUsableItem
 {
   public override void _Notification(int what) => this.Notify(what);
 
@@ -32,6 +32,14 @@ public partial class ThrowableItem : Node3D, IInventoryItem
     Pickup.BodyEntered += OnEntered;
   }
 
+  public void Use()
+  {
+    if (ThrowableItemInfo.HealHPAmount > 0)
+      Game.HealHP(ThrowableItemInfo.HealHPAmount);
+    if (ThrowableItemInfo.HealVTAmount > 0)
+      Game.HealVT(ThrowableItemInfo.HealVTAmount);
+  }
+
   public void OnEntered(Node3D body)
   {
     var isAdded = GameRepo.PlayerData.Inventory.TryAdd(this);