Idle user input code

[Ali Abdallah]

Hi All,

Regarding the enhancement of xfpm, there is a nice feature reported by 
many, and also i would like to have it, the feature of reducing the 
screen luminosity when the computer in inactive (Configurable for sure), 
for that i have to catch any user input and reset a timer for example, i 
didn't yet write anything here, since i don't have a very good 
experience with X stuff, i want to have this code as clean as possible, 
so i'm asking here because you do have good experience.

So if you have an already cooked code in this, i will be greatly 
appreciated your help.

Best Regards,
Ali.