Taskbar icon and maintanance tab

1) have an option to keep the taskbar icon in place and mezzmo interface running when x ing out of the program
2) add an update library button in the taskbar popup ( serviio had something like "force update" )
3) in maintanace tab add more options for auto updating such as hourly or just have it update automatically every time a new file is added

Thank you for the suggestions! Actually, all of them were suggested previously and are already on our development list, so they'll be implemented gradually over the next few releases.