[AD] joystick override

[Vincent Penquerc'h <Vincent.Penquerch@xxxxxxxxxx>]

Allows one to select the joystick device in the config file.
I don't have a joystick, but it picks up the mouse device fine,
though it obviously doesn't pass the check tests.

I'm not sure why it stops as soon as one joystick is found though,
it means you can't have two joysticks at the same time ? Or is
it relying on a multiplexing device ?

-- 
Vincent Penquerc'h

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