Enables SystemTray and TrayIcon support on your Griffon application.

The TrayIcon class is actually JPopupTrayIcon by Michael Biem (from the Fishfarm project), which is in turn based on Alex Potochkin's JXTrayIcon. In short words this class allows you to display a JPopupMenu in the systemTray as opposed to a regular, plain PopupMenu (AWT stuff, yuck!)