A one-line description used by the device to identify the app for the user.
On Android the titles appear above the task manager's app snapshots which are displayed when the user presses the "recent apps" button. Similarly, on iOS the titles appear in the App Switcher when the user double presses the home button.
To provide a localized title instead, use onGenerateTitle.
This value is passed unmodified to WidgetsApp.title.
final String title