Taskbar icon and maintanance tab

[cwalker1960]

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

[Paul]

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.