This class is the main application. The following events are dispatched by this class:
SwitcherInit - dispatched when the all the listeners of the switcher are initialised
XMLInit - dispatched after the XML is loaded, all elements aligned on stage and the slideshow is started
SlideShowToggled - dispatched when the slideshow is either sitched on or off. This event has the following properties:
state - evaluates to either "true" or "false" (string) denoting if the slidshow was switched on or off.