Reworking item spawn, adding item conversion.

Assets/Scripts/GameAssets.cs

@@ -0,0 +1,16 @@
+using UnityEngine;
+
+public class GameAssets: MonoBehaviour
+{
+    public static GameAssets Instance;
+
+    public Material MissingMaterial;
+    
+    private void Start()
+    {
+        if (Instance == null)
+        {
+            Instance = this;
+        }
+    }
+}