Iterate through files in the file sidebar with keyboard

[WhiteNoise]

Open file automatically in accord to file explorer focus using keyboard navigation

Now when file explorer can have a focus (0.15.6.) and can be navigated by keyboard (kudos for that!), I believe that when we go through the files in explorer using keyboard, active pane should reflect that and automatically switch to each file which is in focus of navigation (in the explorer) It is expected behavior, used in majority in word processors/PKM apps (like Notes, Bear, Notational Velocity, DevonThink, Scrivener etc). Current behavior (no change of the file in active view) is more si…