Last life cycle refactor updates + add comprehensive documentation (#57)

Co-authored-by: Michal Pikulski <michal.a.pikulski@gmail.com>
Reviewed-on: #57

Assets/Scripts/Interactions/Pickup.cs

@@ -50,10 +50,8 @@ namespace Interactions
             ItemManager.Instance?.RegisterPickup(this);
         }
         
-        protected override void OnDestroy()
+        internal override void OnManagedDestroy()
         {
-            base.OnDestroy();
-            
             // Unregister from ItemManager
             ItemManager.Instance?.UnregisterPickup(this);
         }