Implement file menu.
MODIFY
WalletWasabi.Dependencies/AvalonStudio.Shell
WalletWasabi.Dependencies/AvalonStudio.Shell
-Subproject commit 2fd2e7fdf4099344189a091a9a252f6fe12bfe7b
+Subproject commit abaaca82c2adf0447664fdb28938d28cff66c0f4

Implement file menu.