Management of the configuration is split in many places, the goal is to
regroup stuff together, starting with the loading from file stuff.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
The bitmap mask associated to the Led image on the knob was not used,
probably because the visual gain is negligible compared to the added
complexity to handle it.
So, as compiler warned about it, remove the variable.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>