Plugins: Add hook TODOs

Il2CppInspector.Common/Model/AppModel.cs

@@ -272,6 +272,8 @@ namespace Il2CppInspector.Model
             // Restore stdout
             Console.SetOut(stdout);
 
+            // TODO: Plugin hook PostProcessAppModel
+
             // This is to allow this method to be chained after a new expression
             return this;
         }