ISIS-887: Removing references to isis modules from simpleapp and todoapp.

In addition:
- removed auth*_file config files
* removed ToDoItem's schedule* actions
* removed Quartz scheduler config from todoapp

also:
* removed empty ComponentFactoryRegistrarForToDoApp
* removed empty PageClassListForToDoApp
ISIS-872: removing references to components previously mothballed (in installer-registry.properties, and SystemConstants).
ISIS-884: to avoid possibility of XSS attachs, removing use of setEscapeModelStrings(false) anywhere that the content is dynamic (error messages etc).

Also, for JGrowl based messages, also explicitly calling Wicket's Strings.escapeHtml (the same underlying method that the default escaping does).