- Migrated to null safety
- Migration to ScaffoldMessenger
Added support for:
*context.platform
*context.headline1
*context.headline2
*context.headline3
*context.headline4
*context.headline5
*context.headline6
*context.subtitle1
*context.bodyText1
*context.bodyText2
*context.caption
*context.button
*context.subtitle2
*context.overline
*context.modalRoute
*context.routeSettings