Deleted files still appearing in CasparCG Client

[rrebuffo]

This would help

Server frontend / watchdog

Some fixes and additions : Fixed for real this time the TextBoxes for the paths, now the changes are saved. Added a button to rebuild the scanner’s database. It stops the scanner, removes both _media and pouch__all_dbs__ folders and starts it again. Also added two items in the tray context menu (rebuild media db and open diag window): [tray_context]