app :: AppComponent :: on_stop
It may then be destroyed or go back to a paused state with on_restart.
Triggers are platform specific:
Activity.onStopUIApplicationDelegate applicationDidEnterBackground
	# The application is completely hidden from the user
	#
	# It may then be destroyed or go back to a paused state with `on_restart`.
	#
	# Triggers are platform specific:
	# * Android: `Activity.onStop`
	# * iOS: `UIApplicationDelegate applicationDidEnterBackground`
	fun on_stop do end
					lib/app/app_base.nit:76,2--83,19