v4.5.0

• @deprecated: .modular() extension.
  Use instead:

    return MaterialApp.router(
      routeInformationParser: Modular.routeInformationParser,
      routerDelegate: Modular.routerDelegate,
    );
  

• Added Modular.setInitialRoute.
• Added Modular.setObservers.
• Added Modular.setNavigatorKey.