- add GetEntryForKey() method

GBase/GBaseTable.cs

@@ -196,6 +196,8 @@ namespace GBase
             return true;
         }
 
+        public T GetEntryForKey(int key) => Entries.FirstOrDefault(e => e.Key == key);
+
         /// <summary>
         /// Remove an entry that implements <see cref="IGBaseObject"/> from this <see cref="IGBaseTable"/>
         /// </summary>