Support document browser

[Sputchik]

When i first saw this app, i sideloaded it to test wether it's any good (it is no glaze), and that installation had document browser, which added much more control. You can't really do everything in pythonista file explorer, and be as fast as you do in Files app

I'm sure this is at least toggling an option in app configuration, but it will make the app so much better. This is an IDE afterall, why would you not do that