Enable system sounds and events

[Valtam]

I have spent the last day investigating this and installing sounds to my computer. System wide sounds in Linux Lite (or any XFCE based distro) is incredibly difficult to set up and get working, the only way this could be implemented is if the XFCE devs made this as simple as click and install, but it is far from that at the moment, but who knows in the future. The best we can hope for at the moment is a start up sound in the final but we are perilously close to going over cd size so we'll have to wait and see, might be one of those surprises we sneak in at the end