GUI: Reload configuration files from file system

As a user, I would like to be able to reload the configuration files from the file system. Currently they are read once when starting up the blockserver, which then provides the data for display in the GUI. This means currently the blockserver has to be restarted to pick up when configurations/components/synoptics ... have been changed by something other than the IBEX Client.

Add a manual "refresh" button to the menu and/or reinstate some kind of file system watcher.

Example Use Case:
The config repository has to be reverted via git after a configuration was accidentally deleted.

Traccia il modo in cui blockserver carica i file di configurazione all’avvio e come viene costruito il menu della GUI. Determina se un aggiornamento manuale o un file-system watcher è adatto al caso d’uso richiesto, quindi verifica che le configurazioni ripristinate, i componenti e i synoptics vengano visualizzati senza riavviare blockserver.

Scritto dal modello di indicizzazione a partire dal testo della issue.