Support RouteConfig for convenient initialize.

[dfdgsdfg]

https://api.flutter.dev/flutter/widgets/RouterConfig-class.html

final routes = RouteMap(
  routes: {
    '/': (_) => CupertinoTabPage(
          child: HomePage(),
          paths: ['/feed', '/settings'],
        ),

    '/feed': (_) => MaterialPage(child: FeedPage()),
    '/settings': (_) => MaterialPage(child: SettingsPage()),
    '/feed/profile/:id': (info) => MaterialPage(
      child: ProfilePage(id: info.pathParameters['id'])
    ),
  }
);

# before
void main() {
  runApp(
      MaterialApp.router(
        routerDelegate: RoutemasterDelegate(routesBuilder: (context) => routes),
        routeInformationParser: RoutemasterParser(),
      ),
  );
}

# after maybe..
void main() {
  runApp(
    MaterialApp.router(
      routerConfig: RouteMaster(routes: routes)
    )
  );
}