IForce FF support

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This was tested with Guillemot Ferrari Force Feedback Wheel USB, however, it should work on any wheel that uses the iforce kernel module. Kernel should be compiled with force feedback support for iforce module (a recent Ubuntu distribution works out of the box, 10.10 was tested, earlier should work too). Follow instructions on Setting up force feedback, the important steps being: compile VDrift from source with forcefeedback support (SVN r3012 (27th Dec 2010) or later), edit VDrift.config and set up write permissions for /dev/input/eventX with something similar to:

sudo chmod 777 /dev/input/eventX

Follow VDrift console output for any force feedback related message; when working properly it should say the force feedback has been initialized. In Ubuntu you can do

sudo apt-get install joystick

to install test applications fftest and ffcfstress. fftest should work fine (although the effects are somewhat poor), but ffcfstress erroneously reports that the device has no force feedback support. Still, FF should work well in VDrift. In Windows the driver for the discontinued Guillemot wheel is the same as for Thrustmaster Ferrari Force Feedback Racing Wheel, so there is a good chance that the same applies for this particular Thrustmaster wheel.