Wireless hotkey support

[Matthew Garrett <mjg59 srcf ucam org>]

I've just submitted a patch to hal that should result in hitting a 
wireless hotkey sending an event over dbus. The obvious next step is 
that n-m should catch this and toggle the wireless state. However, I'm 
not entirely clear what level this should be done at - the daemon or the 
applet? I'm leaning towards the daemon, since it's a system-wide event 
and should ideally work even if there's no user logged in. Any other 
opinions?

Secondly, there needs to be some mechanism for keeping track of the 
hardware state. While some buttons are implemented in software, others 
are in hardware. It's important that we not get into a state where 
hitting the hotkey disables the radio while causing nm to bring up the 
interface, or vice-versa. Right now, different drivers seem to expose 
this information in different ways, so presumably we want to look at 
implementing this in hal as well?

-- 
Matthew Garrett | mjg59 srcf ucam org