Add button for automatic library refresh

[Petr Nejedly]

There should be a button on the Repositories tab that will kick off manual library update.

[Petr Nejedly]

added button and a status label

[Former user]

what if I use "./serviio.sh -headless" command?

[Petr Nejedly]

then it'll check for new files every 5 mins as usual.. this button is just to force checking for updated files

[Former user]

Bump!