Made getItem() public, added comment and todo

ManagedPool/Pool_T_.cs

@@ -152,6 +152,7 @@ namespace eu.railduction.netcore.dll.ManagedPool
                 Thread.Sleep(1);   // Block the current thread for short time
 
             } while (true); // retry infinite
+            // Todo [NORMAL]: Add max-tries
             
         }