feat: synced members of `Scaffold` and `AppBar`#104

Merged

daadu merged 2 commits intofluttercommunity:masterfrom daadu:sync-scaffold-appbar

Dec 18, 2021

+78-9

Commits on Dec 18, 2021

BackdropAppBar: synced with AppBar - added new field, added deprecated annotation
daadu
committed
BackdropScaffold: synced with Scaffold - added new field
daadu
committed