Accept more commands from IR

[ElFishi]

Have slimmer watch more keys so more commands can be sent by an IR remote control. Ideally slimmer can deal with the full set of keys on the Squeezebox remote control.

[terba]

I have in plan to extend the command set to make use of all the buttons of JustBoom's IR remote

[ElFishi]

I was about to backtrack from my brazen suggestion to include all buttons. But before I can make a better suggestion I need to hook up some buttons to my system so I can explore the menus of slimmer.