Defer automatic unload to OnDestroy (#8)

Author: mcpiroman

scripts/DllManipulatorScript.cs

@@ -84,9 +84,9 @@ private void OnEnable()
             InitializationTime = timer.Elapsed;
         }
 
-        private void OnApplicationQuit()
+        private void OnDestroy()
         {
-            //FIXME: Because we don't wait for other threads to finish, we might be stealing function delegates from under their nose if Unity doesn't happen to close them yet.
+            //Note on threading: Because we don't wait for other threads to finish, we might be stealing function delegates from under their nose if Unity doesn't happen to close them yet.
             //On Preloaded mode this leads to NullReferenceException, but on Lazy mode the DLL and function would be just reloaded so we would up with loaded DLL after game exit.
             //Thankfully thread safety with Lazy mode is not implemented yet.