enhance: more GUI options to exit Freevo

[pablo33]

Hi, I would be desirable to have at least the three classic options to exit freevo2.

Options should be at least:

• exit freevo2 (and go to the desktop)
• exit freevo2 an shutdown.
• Cancel

maybe a reboot option would be nice too.

The only options I see in config file are:

 [...]
# Begin Group: Plugin > Shutdown
# | Shutdown plugin for the main menu
#
plugin.shutdown.activate = <default: 90>

# | Show window asking for confirmation of shutdown
plugin.shutdown.confirm = <default: True>

# | Default item. Either 'system' for system shutdown or 'freevo' for
# | Freevo shutdown.
# | Allowed values: system, freevo
plugin.shutdown.default = freevo
#
# End Group: Plugin > Shutdown
[...]