[Request] Show file processing completion percentage per file on Files > Processing window

[Sprooty]

Dashboard already has similar functionality; would be good to see it on processing tab

[revenz]

Depends on #54

Also make the "Processing" tab auto-refresh, if that's the active tab. Only this tab will auto-refresh. Auto refreshing other tabs could be a drain on the system due to how long it can take to get this data. The skybox/overview at the top will auto-refresh too if "Processing" is astive.