Monitor the server and notify the user if new files are added

[Will Lunniss]

==== Basic idea ==== Keep the server status data updated in the background and show a notification when server finds new files

==== Example ==== Serviio has found X new files. The last file added was filename.avi

==== User options ==== Enable background notifications: yes/no

Update interval: time in minutes

==== Implementation decisions ==== Decide between:

Have a server specific option that is managed though server edit view to check that server

Check all servers

Check last used server

I prefer the first option

[Will Lunniss]

First go is now implemented. Need to refine controls.