Began working on a graphical playground for testing.

Improved SDL exception class.

Engine code changes.

General progress.

src/SlatedGameToolkit.Tools/Commands/HelpCommand.cs

@@ -52,5 +52,10 @@ namespace SlatedGameToolkit.Tools.Commands
         {
             return invokers;
         }
+
+        public void Dispose()
+        {
+            
+        }
     }
 }