migrate IShell extension methods to Shell.
MODIFY
WalletWasabi.Dependencies/AvalonStudio.Shell
WalletWasabi.Dependencies/AvalonStudio.Shell
-Subproject commit 8c20244334cddb0a0d834cd4ae7087ec3bef6684
+Subproject commit a7b3ac6176918de412b5692d4ee7a110bd8584b2

migrate IShell extension methods to Shell.